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Fulltext Kebolehulangan respons auditori keadaan mantap pada golongan dewasa lanjut umur bermasalah pendengaran sensorineural

Akmaliza Ali, Ellin Fariza Selamat

Jurnal Sains Kesihatan Malaysia, 2010;8(1):19-24.
MyJurnal

Kajian terdahulu mendapati Respons Auditori Keadaan Mantap (ASSR) mempunyai variasi yang besar dalam meramal ambang pendengaran, manakala kebolehulangan ASSR masih kurang dilaporkan. Kajian ini bertujuan untuk menentukan kebolehulangan ASSR dalam menilai ambang pendengaran golongan dewasa lanjut umur yang bermasalah pendengaran sensorineural. Seramai 15 orang subjek berumur antara 55 hingga 75 tahun terlibat dalam kajian ini. Ambang pendengaran ditentukan menggunakan audiometri nada tulen (PTA) dan ASSR pada frekuensi 0.5, 1, 2 dan 4 kHz, di mana ASSR diulang pada 0.5 dan 1 kHz. Secara keseluruhannya, nilai ambang ASSR adalah lebih tinggi daripada PTA. ANOVA satu hala menunjukkan perbezaan antara ambang PTA dan ASSR adalah tidak signifikan pada semua frekuensi. Terdapat korelasi yang signifikan antara ambang PTA dan ambang ASSR pada 0.5 kHz (r = 0.77, p < 0.05), 1 kHz (r = 0.45, p < 0.05), 2 kHz (r = 0.58, p < 0.05) dan 4 kHz (r = 0.73, p < 0.05). Ujian t berpasangan menunjukkan tiada perbezaan signifikan antara ujian ASSR pertama dan ASSR ulangan pada frekuensi 0.5 kHz (t = 2.09, p > 0.05) dan 1 kHz (t = 0.436, p > 0.05). Korelasi Pearson menunjukkan korelasi yang sederhana di antara dua pengukuran ASSR pada 0.5 kHz (r = 0.68, p < 0.001) dan 1 kHz (r = 0.60, p < 0.001). Hasil kajian ini mendapati bahawa ambang pendengaran ASSR tidak berubah secara signifikan jika diulang uji dan ujian ASSR boleh disarankan sebagai alternatif kepada PTA dalam menentukan ambang pendengaran golongan dewasa lanjut usia bermasalah pendengaran sensorineural.

Matched MeSH terms: Analysis of Variance
Fulltext Classification of Targets and Distractors Present in Visual Hemifields Using Time-Frequency Domain EEG Features

Sweeti, Joshi D, Panigrahi BK, Anand S, Santhosh J

J Healthc Eng, 2018;2018:9213707.
PMID: 29808111 DOI: 10.1155/2018/9213707

This paper presents a classification system to classify the cognitive load corresponding to targets and distractors present in opposite visual hemifields. The approach includes the study of EEG (electroencephalogram) signal features acquired in a spatial attention task. The process comprises of EEG feature selection based on the feature distribution, followed by the stepwise discriminant analysis- (SDA-) based channel selection. Repeated measure analysis of variance (rANOVA) is applied to test the statistical significance of the selected features. Classifiers are developed and compared using the selected features to classify the target and distractor present in visual hemifields. The results provide a maximum classification accuracy of 87.2% and 86.1% and an average classification accuracy of 76.5 ± 4% and 76.2 ± 5.3% over the thirteen subjects corresponding to the two task conditions. These correlates present a step towards building a feature-based neurofeedback system for visual attention.

Matched MeSH terms: Analysis of Variance
Fulltext Evaluation of Bond Strength and Load Deflection Rate of Multi-stranded Fixed Retainer Wires: AnIn-VitroStudy

Samson RS, Varghese E, Uma E, Chandrappa PR

Contemp Clin Dent, 2018 3 31;9(1):10-14.
PMID: 29599576 DOI: 10.4103/ccd.ccd_632_17

Background: Fixed orthodontic retainers must be well retained on the tooth surfaces, allow physiologic movement of teeth and exert minimal forces on the teeth to be retained. Previous studies analyzed the bond strength and amount of deflection caused due to the debonding force but not the magnitude of force needed for unit deformation.
Aims: This study aims to evaluate and compare the bond strength and load deflection rate (LDR) of three different fixed retainer wires.
Materials and Methods: The wires were divided into three Groups: A - three-stranded twisted ligature wire, B - Bond-A-Braid (Reliance Orthodontics), and C - three-stranded twisted lingual retainer wire (3M Unitek). Twenty models were prepared for each group with a passive 15 mm long lingual retainer wire bonded to two lower incisors. An occlusogingival force was applied to the wire until it debonded. For LDR, three-point bending test was done at 0.5 mm deflection. These forces were measured using a Universal Instron Testing Machine.
Statistical Analysis: Mean bond strength/LDR and pairwise comparisons were analyzed with one-way ANOVA and Tukey's honest significant differencepost hoctest, respectively.
Results: Group C exhibited the highest mean bond strength and LDR of 101.17N and 1.84N, respectively. The intergroup comparisons were all statistically significant.
Conclusion: Compared to the other two wire types, Group C might be better retained on the teeth due to its higher bond strength. With its relatively higher LDR value, it may resist deformation from occlusal forces, thereby reducing inadvertent tooth movement and yet remain flexible enough to allow physiologic tooth movements.

Matched MeSH terms: Analysis of Variance
Contactless Visualization of Latent Fingerprints on Nonporous Curved Surfaces of Circular Cross Section-A Statistical Evaluation on the Materials as Plane Mirror

Low WZ, Khoo BE, Abdullah AFLB

J. Forensic Sci., 2018 Jul;63(4):1092-1098.
PMID: 29178492 DOI: 10.1111/1556-4029.13702

A new contactless technique for latent fingerprint visualization on nonporous curved surfaces of circular cross section was introduced by Low et al. (1). The technique utilizes a plane mirror to convey the light rays toward the inspected surfaces for latent fingerprint visualization. This research activity came up as an extension of the previous study which utilized an aluminum plate as the plane mirror to illuminate the inspected surfaces. Dulling spray was used to increase the diffuse component of the reflective aluminum plate. However, the amount of dulling spray will affect the uniformity of the illumination on the inspected curved surfaces. In this study, a study on the new materials for the plane mirror was carried out. Coated aluminum, opal, and ground glass diffusers were selected as the new materials. The performance of the new materials was compared to the aluminum based on the quality of the captured images on various nonporous cylindrical surfaces. A statistical approach known as randomized complete block design was used to design the experiment. The quality of the captured images was obtained using Spectral Image Validation and Verification. Two-way analysis of variance and Fisher's least significant difference test were used to analyze the quality of the images. From the results of the statistical analysis, coated aluminum has the best performance compared to aluminum, opal, and ground glass diffusers.

Matched MeSH terms: Analysis of Variance
Fulltext Organizational commitment among public employees: a case study in a public university

Mohamed Fajil Abdul Batau, Ahmad Shah Pakeer Mohamed

Malaysian Journal of Social Sciences and Humanities, 2016;1(2):9-16.
MyJurnal

This study examines the factors that influence organizational commitment among public employees in
residential colleges in the University of Malaya. A total of 100 employees representing 12 colleges
responded to the questionnaires that were designed to measure their motivation and level of
commitment. The data obtained were analyzed using correlation, analysis of variance and regression
analysis were used in order to achieve the objectives of the study. The findings of this study indicated
that there are significant and positive relationships between all factors (employment compensation,
training and development, career development and management support) with organization
commitment. Furthermore, the findings also showed a directional relationship between independent
and dependent variables by which the public employees at the colleges have positive commitment to
the organization when the management provides attractive training and development, career
development and good management support. In addition, the findings indicated that career
development was the most dominant factor influencing organizational commitment followed by
training development and job compensation. However, management support factor does not affect the
organizational commitment among public employees compared to the other factors.

Matched MeSH terms: Analysis of Variance
Fulltext Brain activation display functional asymmetry in response to action, background and tonal frequency during a pitch memory processing: an fMRI study

Ahmad Nazlim Yusoff, Khairiah Abdul Hamid, Farah Nabila Ab Rahman, Mazlyfarina Mohamad, Khairiah Abdul Hamid, Siti Zamratol-Mai Sarah Mukari

Jurnal Sains Kesihatan Malaysia, 2018;16(1):35-44.
MyJurnal

In this study, the asymmetry of the main effects of action, background and tonal frequency during a pitch memory processing
were investigated by means of brain activation. Eighteen participants (mean age 27.6 years) were presented with low and
high frequency tones in quiet and in noise. They listen, discriminate and recognize the target tone against the final tone
in a series of four distracting tones. The main effects were studied using the analysis of variance (ANOVA) with action (to
wring (rubber bulb) vs. not to wring), background (in quiet vs. in noise) and frequency (low vs. high) as the factors (and
levels respectively). The main effect of action is in the right pre-central gyrus (PCG), in conformation with its contralateral
behavior. The main effect of background indicated the bilateral primary auditory cortices (PAC) and is right lateralized,
attributable to white noise. The main effect of frequency is also observed in PAC but bilaterally equal and attributable to
low frequency tones. Despite the argument that the temporo-spectral lateralization dichotomy is not especially rigid as
revealed by the main effect of frequency, right lateralization of PAC for the respective main effect of background clearly
demonstrates its functional asymmetry suggesting different perceptual functionality of the right and left PAC.

Matched MeSH terms: Analysis of Variance
Morphological characterization and selection for high yielding and powdery mildew resistant pea (pisum sativum) lines

Ajmal Iqbal, Shahen Shah, Mohammad Nisar, Abdul Ghafoor

Sains Malaysiana, 2017;46:1727-1734.

Twenty lines of Pisum sativum particularly developed for high yield and resistant to powdery mildew were evaluated along with two parents (Falloner and 11760-3ER) and two checks (Climex and a local cultivar) with the objectives to determine morphological characterization, yield potential and resistance to powdery mildew. On the basis of one way cluster, the 24 lines were mainly grouped into four clusters, especially on the vegetative and yield contributing traits. It was observed that the tall and high yielding lines were grouped in cluster-III while the dwarf and high yielding lines were grouped in cluster-IV. Analysis of variance (ANOVA) showed significant difference (p<0.05) in the yield of 24 pea lines. The average grain yield of the 24 pea lines ranged from 22.87 to 102.54 g. The highest grain yield was produced by PL-4 (102.54 g plant-1) followed by PL-5 (82.14 g plant-1). Of the 24 pea lines, two lines (PL-4 and PL-5) were highly resistant to powdery mildew disease. Therefore, the newly developed PL-4 and PL-5 lines were high yielding and highly resistant. Among the 19 morphological traits, six (Eigenvalue >1.0) contributed more than 80% variability among the materials.

Matched MeSH terms: Analysis of Variance
Salvinia molesta dan pistia stratiotes sebagai agen fitoremediasi dalam rawatan air sisa kumbahan

Marlia M. Hanafiah, Nan Hamiza Syazira Megat Mohamad, Nur Izzah Hamna Abd. Aziz

Sains Malaysiana, 2018;47:1625-1634.

Akumulasi logam berat dan bahan pencemar ke dalam ekosistem akuatik memberi impak negatif kepada alam sekitar dan organisma akuatik. Salvinia molesta dan Pistia stratiotes merupakan spesies yang mempunyai kadar pertumbuhan yang cepat dan berkemampuan dalam mengakumulasi logam berat dan menyerap nutrien menjadikan ia sesuai digunakan untuk merawat air sisa melalui kaedah bioteknologi iaitu fitoremediasi. Kajian ini dijalankan untuk menentukan kualiti air sisa kumbahan sebelum dan selepas rawatan menggunakan kaedah fitoremediasi. Selain itu, objektif kajian ini juga adalah untuk menilai keberkesanan Salvinia molesta dan Pistia stratiotes sebagai agen fitoremediasi bagi rawatan air sisa. Sampel tumbuhan akuatik berbeza berat iaitu 10, 20 dan 30 g diuji untuk rawatan tersebut. Ujian ANOVA satu hala menunjukkan perbezaan kadar pengurangan jumlah pepejal terampai dan ammoniakal nitrogen yang bererti (p<0.05) bagi 10, 20 dan 30 g Pistia stratiotes dan Salvinia molesta sepanjang kajian dijalankan iaitu daripada hari 0 sehingga hari ke-7. Keputusan kajian juga menunjukkan 30 dan 20 g Pistia stratiotes dan Salvinia molesta dapat menyingkirkan jumlah pepejal terampai dan ammoniakal nitrogen dengan lebih cepat berbanding berat tumbuhan 10 g. Ujian ANOVA satu hala juga tidak menunjukkan perbezaan yang bererti bagi kadar pengurangan jumlah pepejal terampai dan ammoniakal nitrogen antara Pistia stratiotes dan Salvinia molesta.

Matched MeSH terms: Analysis of Variance
Analysis of 2-category data from two matched samples

Lee J

Med. J. Malaysia, 1975 Dec;30(2):103-9.
PMID: 1228374
Matched MeSH terms: Analysis of Variance
Optimization of Manganese Reduction in Biotreated POME onto 3A Molecular Sieve and Clinoptilolite Zeolites

Jami MS, Rosli NS, Amosa MK

Water Environ. Res., 2016 Jun;88(6):566-76.
PMID: 26556067 DOI: 10.2175/106143015X14362865227157

Availability of quality-certified water is pertinent to the production of food and pharmaceutical products. Adverse effects of manganese content of water on the corrosion of vessels and reactors necessitate that process water is scrutinized for allowable concentration levels before being applied in the production processes. In this research, optimization of the adsorption process conditions germane to the removal of manganese from biotreated palm oil mill effluent (BPOME) using zeolite 3A subsequent to a comparative adsorption with clinoptilolite was studied. A face-centered central composite design (FCCCD) of the response surface methodology (RSM) was adopted for the study. Analysis of variance (ANOVA) for response surface quadratic model revealed that the model was significant with dosage and agitation speed connoting the main significant process factors for the optimization. R(2) of 0.9478 yielded by the model was in agreement with predicted R(2). Langmuir and pseudo-second-order suggest the adsorption mechanism involved monolayer adsorption and cation exchanging.

Matched MeSH terms: Analysis of Variance
Fulltext Data normatif timpanometri di kalangan kanak-kanak Melayu prasekolah

Noor Alaudin Abdul Wahab, Norashikin Chahed

Jurnal Sains Kesihatan Malaysia, 2010;8(1):13-18.
MyJurnal

Kajian ini bertujuan untuk mendapatkan data normatif timpanometri di kalangan kanak-kanak Melayu prasekolah dan membandingkannya menurut jantina. Ini kerana faktor bukan patologi seperti umur, jantina dan bangsa mempengaruhi data normatif timpanometri. Sehubungan itu, garis panduan saringan telinga tengah oleh American Speech and Hearing Association (ASHA) yang menggunakan data normatif timpanometri kanak-kanak Kaukasian mungkin tidak sesuai untuk populasi kanak-kanak Melayu. Parameter timpanometri yang diukur ialah puncak statik admitan akustik dikompensasi (puncak Ytm), isipadu salur telinga luar (Vea) dan kelebaran timpanogram (TW). Seramai 161 orang kanak-kanak Melayu (80 orang kanak-kanak lelaki dan 81 orang kanak-kanak perempuan) berumur antara 4 hingga 6 tahun terlibat di dalam kajian ini. Bagaimanapun, hanya seramai 45 orang kanak-kanak lelaki dan 46 orang kanak-kanak perempuan (163 dari keseluruhan 182 telinga) memenuhi kriteria inklusi iaitu lulus pemeriksaan otoskopi dan saringan pendengaran serta menunjukkan refleks akustik ipsilateral pada 1000 Hz. Ujian ANOVA Campuran dua-hala untuk membandingkan min parameter timpanometri kanak-kanak lelaki dan perempuan menunjukkan tiada perbezaan yang signifikan; min puncak Ytm (p > 0.05), min Vea (p > 0.05), dan min TW (p > 0.05). Oleh itu, data kedua-dua kumpulan ini digabungkan. Secara keseluruhan, nilai min puncak Ytm ialah 0.55 ± 0.28mmhos, min Vea ialah 0.90 ± 0.39 cm3, dan min TW ialah 104.68 ± 32.08 daPa. Julat normal persentil ke-90 bagi puncak Ytm ialah antara 0.27 hingga 1.18 mmhos, Vea antara 0.45 hingga 1.65 cm3 dan TW antara 59.60 hingga 149.80 daPa. Hasil kajian mencadangkan data normatif timpanometri ini sesuai digunakan ke atas kanak-kanak Melayu prasekolah namun ianya tidak perlu dibezakan mengikut jantina. Sekiranya setiap satu nilai TW > 200 daPa dan Vea > 1.0 cm3 oleh ASHA diaplikasi ke atas kanak-kanak Melayu prasekolah, maka masing-masing akan menyebabkan kadar rujukan yang rendah dan kadar rujukan yang berlebihan.

Matched MeSH terms: Analysis of Variance
Fulltext Decision making and performance of Malaysian rugby sevens referees

Mohamad Nizam Nazarudin, Suppiah, Pathmanathan K., Mohamad Razali Abdullah, Mohd Sofian Omar Fauzee, Parnabas, Vincent, Nagoor Meera Abdullah

Movement Health & Exercise, 2015;4(1):61-75.
MyJurnal

This study aims to examine the decision making by rugby sevens referees, and its relationship with the referees' performance. The instruments used in this study are the Rugby Referee Decision Making Test (α=.74) and the Referee Sevens Field Performance Evaluation (α=.94). It was administered to 132 rugby sevens referees (mean age 33.4 + 1.5 years; 132 males) from the Malaysian Rugby Union (MRU), which have been refereeing in 10 rugby sevens tournaments in Malaysia. Descriptive and Inferential statistics (one way ANOVA and Pearson's Correlation) were employed to analyse the data. Decision Making ( ̅= 24.13, SD=5.24) and performance ( ̅= 136.45, SD = 4.47) were identified at a moderate level. The findings indicated no significant differences [F= (3, 128) =.246, p>0.05] in the decision making across age level, but there were significant differences [F= (3, 128) =63.159, p

Matched MeSH terms: Analysis of Variance
Individual factors and perceptions of organization safety level: evidence from a manufacturing organization in Malaysia

Shah Rollah Abdul Wahab, Durrishah Idrus, Christopher J. Rees, Ishak Mad Shah

Journal of Occupational Safety and Health, 2011;8(1):33-48.
MyJurnal

Individual factors have been considered to be a key issue to organizations’ performance and survival. Specifically, previous studies provide evidence that individual factors are closely associated with accidents in the workplace. Therefore, this study seeks to investigate the relationship between individual factors and workplace safety. 50 respondents have been randomly chosen from a manufacturing company in Johor Bahru, Malaysia. Data are collected using a survey and are analyzed using SPSS version 16.0. A descriptive statistic, cross tabulation, independent sample t-test and one-way between groups ANOVA are employed to interpret findings of the study. Findings show that employees’ perception on safety performance is at high level (Mean= 115, Standard Deviation= 17.73). Furthermore, the results of cross tabulation demonstrate that individual factors play a key role to determine the organization safety performance level. Another significant finding reveals that there is a significant difference of safety performance mean to two of individual factors namely gender and tenure of service. Individual factors namely gender, age, tenure of service and academic qualification give a significant impact to employees’ perception on safety performance.

Matched MeSH terms: Analysis of Variance
Fulltext Modelling of motion resistance ratios of pneumatic and rigid bicycle wheels

Ahmad, D., Jamarei, O., Sulaiman, S., Fashina, A.B., Akande, F.B.

Pertanika Journal of Science & Technology, 2013;21(1):59-74.
MyJurnal

The motion resistances of 660 mm pneumatic and rigid bicycle wheels of the same rim diameter were measured experimentally using the developed tractor-towed single non-lug narrow wheel motion resistance test rig for traction studies. The motion resistances measured were taken to be the towing forces determined in real time using Mecmesin Basic Force Gauge (BFG 2500). The test variables included two test surfaces [tilled and wet (mud) surfaces], the dynamic load and the towing velocity. The tyre inflation pressure of 414 kPa was chosen to make the surface synonymous with that of the rigid wheel. Motion resistance ratios of the two wheels were determined empirically and through semi-empirical approach. The motion resistances of the rigid wheel were found to be greater than those of the pneumatic wheel for both surfaces. Consequently, the motion resistance ratios of the rigid wheel were greater than those obtained
from the pneumatic wheel. Analysis of variance showed that there were significant differences between the means of the motion resistance measured on the test surfaces, as well as between the two wheels and their interactions with the test surfaces. The motion resistance ratio exhibited a linear relationship with the towing velocity, while the relationship with the dynamic load was quadratic. However, such a relationship is either direct or inverse with the respective variables. The motion resistance ratio models for the pneumatic and rigid wheels showed that on different test conditions of the dynamic loads and the towing velocities, the relationships between the motion resistance ratio and the dynamic load, and motion resistance with dynamic load were also different.

Matched MeSH terms: Analysis of Variance
Fulltext Design and development of a sweet potato digging device

Md. Akhir, H., Ahmad, D., Rukunudin, I. H., Shamsuddin, S., A. Yahya

Pertanika Journal of Science & Technology, 2014;22(1):43-53.
MyJurnal

This paper describes a study on the design, fabrication and testing of a prototype digging device for sweet potato tubers in bris soil. The soil texture was sandy soil (fine sand 94.53%), with mean moisture content of 9.16% and mean bulk density of 1.44 g-cm-3. The soil was prepared in a soil bin. Three types of soil digging tools were designed and fabricated to determine the optimum draft force. These were Flat or plane, V-shaped and Hoe type blades. Plane and V-shaped blades were 30 cm long, and 13 cm wide, while the Hoe type had three rods, 25 mm in diameter, 30 cm long and 6.5 cm wide with sharp cutting edge. The digging tools were tested in a soil bin filled with bris soil to determine the optimum draft force and area of soil disturbance. The results were analysed using statistical analysis of variance (ANOVA). Comparison between all blade types and blade depths to measured draft force and the area of soil disturbed showed that the highest draft of 0.54 kN-m-2 was caused by a flat or plane blade at the optimum depth of 20 cm when the area of soil disturbed was 0.180 m2 . The V-shaped blade had the mean draft of 0.51 kN-m-2, with area of soil disturbance of 0.185 m2 . Thebest choice was V-shaped blade with a rake angle of 30o at 20 cm. depth. The selected blade was fixed onto the sweet potato harvester and tested on bris soil planted with sweet potato of Telong and VitAto varieties. The harvesting efficiency of the machine in bris soil was 93.64% and 90.49% for Telong (Plot A) and VitAto (Plot B) varieties, respectively. The average ground speed and turning time during operation for plots A and B was 0.56 km-hr-1 and 102.7 s and 0.99 km-hr-1 and 81.22 s, respectively. The harvesting efficiencies for both plots showed no significant difference. The total productive time (harvesting time) and unproductive time (turning time) in plot A, at a tractor speed of 0.56 km.hr-1, was 14.8 hours for harvesting a hectare of sweet potato ( 0.068 ha.hr-1). In plot B, the total time for harvesting a hectare of sweet potato was 8.35 hours (0.12 ha.hr-1) at a tractor speed of 0.99 km.hr-1. The average harvesting time for both plots was 11.47 hr.ha-1. The average field work rate was 0.087 ha.hr-1 or 34 man-hr.ha-1 compared to manual harvesting of 150 man-hrs.ha-1.

Matched MeSH terms: Analysis of Variance
Fulltext The angiotensin converting enzyme (ACE) I/D gene polymorphism in Malaysian well trained athletes

Hazwani Ahmad Yusof, Rabinderjeet Singh, Zainuddin Zafarina, Kieron Rooney, Ahmad Munir Che Muhamed

Jurnal Sains Sukan & Pendidikan Jasmani, 2014;3(1):20-33.
MyJurnal

The purpose of this study was to examine the effect of the ACE I/D gene polymorphism on athletic status and physical performance of well-trained Malaysian athletes. The distribution of ACE I/D gene polymorphism among 180 well trained athletes was compared with 180 sedentary controls. 20 meter Yo-Yo intermittent recovery and leg strength tests were used to measure maximal oxygen consumption (VO2max) and leg strength value of athletes with different ACE I/D genotype, respectively. Chi-Square and one way ANOVA tests were used for data analysis. The II and DD genotype were more prevalent among the endurance athletes and the strength/ power athletes compared to the other groups, respectively (p=0.00). The VO2max was not significantly associated with ACE genotype in athlete (p=0.828). However, athletes with the DD genotype had recorded a greater result for leg strength (113.8 ± 36.2) than those with the II (96.2 ± 28.0) and the ID (112.2 ± 33.5) genotype (p=0.047). This study supports the notion that ACE I/D gene polymorphism might be a genetic factor associated with athletic status and strength performance among the Malaysian population. Future studies with more representation of endurance athletes might able to detect the association between I allele and endurance performance.

Matched MeSH terms: Analysis of Variance
Fulltext Optimization studies on microwave assisted extraction of dragon fruit (Hylocereus polyrhizus) peel pectin using response surface methodology

Rahmati, S., Abdullah, A., Momeny, E., Kang, O.L.

International Food Research Journal, 2015;22(1):233-239.
MyJurnal

Optimization of microwave assisted extraction of dragon fruit peel pectin was conducted using respond surface methodology. Effect of extraction conditions, i.e. pH value (X1), extraction time (X2) and solid-liquid ratio (X3) on the extraction yield was investigated using a central composite experimental design. Optimization of microwave assisted extraction was performed and three-dimensional (3D) response surface plots were derived from the mathematical models. Analysis of variance (ANOVA) was conducted and indicated a significant interaction between extraction conditions (pH value and extraction time) and extraction yield. The optimum conditions of microwave assisted extraction were as follows: X1 = 2.07; X2 = 65 s and X3 = 66.57. The verification test on pectin extraction was performed and revealed a perfect agreement between experimental and predicted values. The maximum predicted yield of pectin extraction was 18.53%. Overall, application of microwave assisted extraction can give rise to high quality dragon fruit peel pectin.

Matched MeSH terms: Analysis of Variance
Fulltext A comparative study on the inter-session and interexaminer reliability of corneal power measurement using various keratometry instruments

Md. Muziman Syah, M. M., Mutalib, H. A., Sharanjeet Kaur, M. S., Khairidzan Khairidzan, M. K.

International Medical Journal Malaysia, 2016;15(1):69-74.
MyJurnal

Introduction: The purpose of this study was to evaluate inter-session repeatability, inter-examiner
reproducibility and inter-device agreement of corneal power measurements from manual keratometer,
autokeratometer, topographer, Pentacam high resolution and IOLMaster. Methods: Two sets of mean
corneal power measurements (n=40) were compared for inter-session repeatability and inter-examiner
reproducibility in each instrument. Repeatability and reproducibility were evaluated by within-subject
standard deviation (Sw), coefficient of variation (COV) and intraclass correlation coefficient (ICC). A oneway
repeated measures analysis of variance was conducted to compare differences in the corneal power
between each instrument pair. The Bland and Altman analysis and Pearson’s correlation were employed to
assess agreement and determine strength of relationship between measurements. Results: There were no
significant differences in mean corneal power measurements between 2 different visits (p > 0.05). The Sw
and COV values between 2 visits were lower than 0.09 D and 0.20 % respectively. The ICCs were stronger
than 0.99 in all instruments. For reproducibility of each instrument, differences of the measurements
between 2 different examiners were also insignificant (p > 0.05). The Sw and COV values between 2
examiners were lower than 0.11 D and 0.23 % respectively. The ICCs were 0.99 and above in all instruments.
The 95% limit of agreement between instruments ranged from -0.29 to 1.13 D and the r-values were stronger
than 0.84. Conclusion: The corneal power measurements using these 5 instruments were repeatable and
reproducible. These instruments can also be used interchangeably, however the topographer should be used
with caution.

Matched MeSH terms: Analysis of Variance
Evaluation of Microleakage Between Different Post and Core Systems Under Gradual Loading: an In-Vitro Study

Salim NA, Muttlib NAA, Alawi R, Rahman NA, Ariffin Z

Acta Stomatol Croat, 2018 Sep;52(3):218-226.
PMID: 30510297 DOI: 10.15644/asc52/3/5

Objective: This study aimed to compare the difference in marginal dye penetration between everStick, Parapost XP, Parapost fiber white and control groups under gradual loading.
Materials and Methods: Sixty-eight human maxillary permanent incisors were divided into four groups. Each specimen was endodontically treated with step-back technique and prepared for each post system according to experimental groups, subsequently cemented in the canal. Composite resin cores were built and laboratory fabricated metal crowns were cemented. All specimens except those in the control group were subjected to thermal cycling. All groups were subjected to gradual loading from 0N-50N for 100 cycles. Specimens were sectioned transversely and the depths of dye penetration along the post were measured. Data were entered in SPSS ver. 22 and analyzed using two-way ANOVA test.
Results: There was no significant difference in marginal dye penetration between each group (p-value>0.05). However, there was a significant difference in percentage of marginal dye penetration between all groups (p-value<0.05); post-hoc comparison showed significant difference between Fiber White and Control groups (p-value=0.009).
Conclusion: All the groups showed dye penetration but the percentage was significant only between Parapost Fiber White and the control groups.

Matched MeSH terms: Analysis of Variance
Fulltext Assessing the reliability of subjective evaluation for comfortable driving postures

Darliana Mohamad, Dian Darina Indah Daruis, Baba Md Deros, Ahmad Rasdan Ismail

Malaysian Journal of Public Health Medicine, 2016;16(20):14-19.
MyJurnal

Drivers’ posture is one of the factors that can contribute to driving discomfort. Subjective evaluation is needed in determining the driving discomfort problem. The purpose of this study is to examine the reliability of different driving postures that may lead to drivers’ discomfort. A total of thirty-four healthy Malaysian drivers were involved in this study. Respondents were required to sit on the driver’s seat with the required adjustments of three different postures and fill-in the given subjective evaluation form. The same procedure was repeated for each respondent after three days for purpose of conducting test retest evaluation. The reliability statistical analysis result shows the study was reliable and valid with a Cronbach’s alpha coefficient equal to 0.827. The comparison means that ANOVA analysis also shows significance difference between these three groups of postures for all measured parameters. In conclusion, the result from this study shows the subjective evaluation conducted is reliable and can be used for drivers’ posture discomfort study.

Matched MeSH terms: Analysis of Variance

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