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Insight into global mosquito biogeography from country species records

Foley DH, Rueda LM, Wilkerson RC

J Med Entomol, 2007 Jul;44(4):554-67.
PMID: 17695008

To advance our limited knowledge of global mosquito biogeography, we analyzed country occurrence records from the Systematic Catalog of the Culicidae (http://www.mosquitocatalog. org/main.asp), and we present world maps of species richness and endemism. A latitudinal biodiversity gradient was observed, with species richness increasing toward the equator. A linear log-log species (y)-area (x) relationship (SAR) was found that we used to compare observed and expected species densities for each country. Brazil, Indonesia, Malaysia, and Thailand had the highest numbers of species, and Brazil also had the highest taxonomic output and number of type locations. Brazil, Australia, the Philippines, and Indonesia had the highest numbers of endemic species, but excluding small island countries, Panama, French Guiana, Malaysia, and Costa Rica had the highest densities of total species and endemic species. Globally, 50% of mosquito species are endemic. Island countries had higher total number of species and higher number of endemic species than mainland countries of similar size, but the slope of the SAR was similar for island and mainland countries. Islands also had higher numbers of publications and type locations, possibly due to greater sampling effort and/or species endemism on islands. The taxonomic output was lowest for some countries in Africa and the Middle East. A consideration of country estimates of past sampling effort and species richness and endemism is proposed to guide mosquito biodiversity surveys. For species groups, we show that the number of species of Anopheles subgenus Anopheles varies with those of subgenus Cellia in a consistent manner between countries depending on the region. This pattern is discussed in relation to hypotheses about the historical biogeography and ecology of this medically important genus. Spatial analysis of country species records offers new insight into global patterns of mosquito biodiversity and survey history.

Matched MeSH terms: Regression Analysis
Fulltext Internal, external, networking factors and challenges of small medium enterprise (SMEs) internationalization

Nur Zania Azurin Abdullah Sani, Ahmad Shazeer Mohamed Thaheer, Zahariah Mohd Zain

Journal of Academia Universiti Teknologi MARA Negeri Sembilan, 2019;7(101):133-141.
MyJurnal

Internationalization procedure of small to medium-sized enterprises (SMEs) is part of the increasing economy. The study aims to identify relationships between the factors influencing the SMEs to internationalize and identifying the most impactful factor that affects the internationalization of SMEs. The factors affecting internationalization of SMEs identified were external, internal, networking as well as barriers and challenges. The study focusses on SMEs in the service sector in Klang Valley, Malaysia. The methods used to conduct the survey is by distributing the questionnaire through email. There are 100 selected SMEs in the service sector which are listed in SME Corp Malaysia website and MATRADE website. Regardless of whether the SME’s are practising international business or not, they will still be one of the potential respondents. The data were examined and obtained using the statistical software SPSS. The analysis used is reliability analysis, correlation analysis and regression analysis to meet the research objectives. The expected outcome from this research is to analyze the factors that will impact the internationalization of SMEs. The results of the analysis show that all the variables have a low positive correlation. The most influential factors that effects SMEs decision to go international are barriers and challenges.

Matched MeSH terms: Regression Analysis
Fulltext Assessment of adolescent-friendly health services in north-eastern Malaysia: a sequential explanatory mixed method study

Hafizuddin Awang, Azriani Ab Rahman, Surianti Sukeri, Noran Hashim, Nik Rubiah Nik Abdul Rashid

Malaysian Journal of Medicine and Health Sciences, 2019;15(104):64-64.
MyJurnal

Introduction: The Ministry of Health Malaysia introduced the national best practices for adolescent-friendly health services in 2018 and it served as an assessment tool in the accreditation of adolescent-friendly clinic status. This study was conducted in Kelantan with the objective to determine the proportion of adolescent-friendly clinics and its determinants and perceptions of healthcare providers regarding the facilitating factors in providing adoles-cent-friendly health services. Methods: The research design was sequential explanatory mixed method. State wide clinics assessment was done to estimate the proportion of adolescent-friendly clinics and to determine the factors associated with adolescent-friendly health services provision. Perceptions of healthcare providers on the facilitating factors for adolescent-friendly health services were explored through in-depth interviews. Descriptive statistics and linear regression analysis were performed for quantitative data, and thematic analysis for qualitative data. Results: Out of 85 health clinics, 30 (35.3%) clinics were accredited as adolescent-friendly. Availability of trained health-care providers in adolescent health modules, private room for adolescent counselling, dedicated team in charge of adolescent programme and adolescent health promotional activities were the statistically significant determinants for adolescent-friendly health services (p

Matched MeSH terms: Regression Analysis
Fulltext Effects of touch-screen technology usage on the hand skills dataset

Aman NA, Chien CW, Judd J, Daud AZC

Data Brief, 2020 Dec;33:106358.
PMID: 33083507 DOI: 10.1016/j.dib.2020.106358

This data article describes the hand skills of pre-school children between five and six years old from five schools under the Ministry of Education Malaysia. These data may be used in a journal article later to show the effects of touch-screen technology usage on hand skills of pre-school children. Demographic characteristics, hand skills ability and frequency of touch-screen technology usage data that was collected from August to September 2019. These data may be used in a future systematic review, meta-analysis and meta-regression analysis to conclude the effects of touch-screen technology usage on children's hand skills. Parents, teachers and health practitioners may refer to these data to note the effects of touch-screen technology usage on hand skills of pre-school children.

Matched MeSH terms: Regression Analysis
Trait driving anger and driving styles among Colombian professional drivers

Useche SA, Cendales B, Alonso F, Montoro L, Pastor JC

Heliyon, 2019 Aug;5(8):e02259.
PMID: 31440599 DOI: 10.1016/j.heliyon.2019.e02259

This study analyzes the association between trait driving anger and driving styles in a sample of Colombian professional drivers. Additionally, the internal and external validity of the Deffenbacher's Driving Anger Scale (DAS-14) was examined in the study population. The DAS-14 and the Spanish Version of the Multidimensional Driving Style Inventory (S-MDSI) were administered to 492 urban bus and taxi operators. Average trait driving anger scores in the study population were similar to those reported in previous validation studies from Spain, Argentina, China, and Malaysia. After deleting three cross-loaded items, confirmatory factor analyses revealed a three-dimensional latent structure for the DAS-14, similar but not equal to the previous Spanish speaking validations. This factorial structure fits the data reasonably well. Finally, linear regression analyses revealed that the three factors of the DAS-14 (impeded progress by others, illegal driving, and direct hostility) significantly predict adaptive and maladaptive driving styles. Overall, the results of this study suggest that the DAS-14 is a reasonably reliable measure of driving anger traits among professional drivers, and it also provides relevant insights for the prevention of risky driving styles in this occupational group.

Matched MeSH terms: Regression Analysis
Knowledge, attitude and practice of food utensils hygiene amongst food handlers in Kuala Pilah, Negeri Sembilan, Malaysia

Siti Nurul Ain Saipullizan, Razalee Sedek, Sahilah Abd. Mutalib

Sains Malaysiana, 2018;47:1527-1533.

This study aimed to evaluate the level of knowledge, attitude and practice (KAP) amongst food handlers in food utensils
hygiene and presence of bacterial contamination on food utensils. There were two approaches used in this study. In the
first approach, 134 of food handlers from 75 food premises were interviewed via questionnaires to assess their knowledge,
attitude and practice. In the second approach, the presence of Staphylococcus aureus, Escherichia coli and total coliform
of 225 utensils (knives (75), chopping boards (75) and dish plates (75)) was examined. The result showed that the food
handlers had sufficient level of knowledge (80.5%), attitude (87.4%) and practice (90.1%). Highest contamination was
found on the chopping boards for the presence of S. aureus (82.8%), E. coli (9.7%) and total coliform (73.9%). Logistic
regression analysis showed that knowledge contributes to the presence of E. coli on the dish plates; and total coliform
on the knives. Thus, ongoing training that focused on food utensils hygiene must be emphasized to improve knowledge,
attitude and practice amongst the food handlers.

Matched MeSH terms: Regression Analysis
Fulltext Incidence and predictors of early seizures in intracerebral haemorrhage and the effect of tranexamic acid

Law ZK, England TJ, Mistri AK, Woodhouse LJ, Cala L, Dineen R, et al.

Eur Stroke J, 2020 Jun;5(2):123-129.
PMID: 32637645 DOI: 10.1177/2396987320901391

Introduction: Seizures are common after intracerebral haemorrhage. Tranexamic acid increases the risk of seizures in non-intracerebral haemorrhage population but its effect on post-intracerebral haemorrhage seizures is unknown. We explored the risk factors and outcomes of seizures after intracerebral haemorrhage and if tranexamic acid increased the risk of seizures in the Tranexamic acid for IntraCerebral Haemorrhage-2 trial.
Patients and methods: Seizures were reported prospectively up to day 90. Cox regression analyses were used to determine the predictors of seizures within 90 days and early seizures (≤7 days). We explored the effect of early seizures on day 90 outcomes.
Results: Of 2325 patients recruited, 193 (8.3%) had seizures including 163 (84.5%) early seizures and 30 (15.5%) late seizures (>7 days). Younger age (adjusted hazard ratio (aHR) 0.98 per year increase, 95% confidence interval (CI) 0.97-0.99; p = 0.008), lobar haematoma (aHR 5.84, 95%CI 3.58-9.52; p

Matched MeSH terms: Regression Analysis
Fulltext Image Analysis of Surface Porosity Mortar Containing Processed Spent Bleaching Earth

Wei Chong B, Othman R, Jaya RP, Shu Ing D, Li X, Wan Ibrahim MH, et al.

Materials (Basel), 2021 Mar 28;14(7).
PMID: 33800634 DOI: 10.3390/ma14071658

Image analysis techniques are gaining popularity in the studies of civil engineering materials. However, the current established image analysis methods often require advanced machinery and strict image acquisition procedures which may be challenging in actual construction practices. In this study, we develop a simplified image analysis technique that uses images with only a digital camera and does not have a strict image acquisition regime. Mortar with 10%, 20%, 30%, and 40% pozzolanic material as cement replacement are prepared for the study. The properties of mortar are evaluated with flow table test, compressive strength test, water absorption test, and surface porosity based on the proposed image analysis technique. The experimental results show that mortar specimens with 20% processed spent bleaching earth (PSBE) achieve the highest 28-day compressive strength and lowest water absorption. The quantified image analysis results show accurate representation of mortar quality with 20% PSBE mortar having the lowest porosity. The regression analysis found strong correlations between all experimental data and the compressive strength. Hence, the developed technique is verified to be feasible as supplementary mortar properties for the study of mortar with pozzolanic material.

Matched MeSH terms: Regression Analysis
Fulltext Relationship between ISO 9001:2015 and operational and business performance of manufacturing industries in a developing country (Indonesia)

Nurcahyo R, Zulfadlillah, Habiburrahman M

Heliyon, 2021 Jan;7(1):e05537.
PMID: 33506119 DOI: 10.1016/j.heliyon.2020.e05537

Previous research has emphasized the need to further investigate the impact of ISO 9001 on company performance in the manufacturing sector of developing countries. Indonesia is one of those developing countries where the implementation of ISO 9001 is yet to be adequately researched. The Indonesian automotive manufacturing industry is still unable to compete with Malaysia and Thailand even though many companies have implemented ISO 9001. This study aimed to examine the relationship between ISO 9001 and operational (productivity, customer satisfaction, and product quality) and business (sales growth, profit rate, and market share) performance of Indonesian automotive component manufacturing industries. It also aimed to identify major obstacles in the effective implementation of ISO 9001. Multiple linear regression analyses about operational and business performance were employed for this purpose. The sample size comprised 50 automotive component manufacturing industries located in the Jakarta, Bogor, Tangerang, and Bekasi region of Indonesia. The study demonstrates that the implementation of the ISO 9001:2015 quality management system has a significant positive impact on the operational performance as well as the business performance. Additionally, the operational performance has a significant positive impact on the business performance. This study also reveals the major obstacles in the effective implementation of ISO 9001 in the manufacturing industry, which include a lack of qualified personnel, inadequate training, employee resistance, and lack of commitment among top-level management executives. It offers clear implications for managers who focus on elements that will enhance the effectiveness of ISO 9001 implementation by choosing the correct strategies, allocating sufficient resources, and improving their firm's performance. The novelty of this study lies in filling the existing research gap, which involves a detailed examination of the relationship between the implementation of ISO 9001 and the company's performance, particularly in manufacturing industries of developing countries.

Matched MeSH terms: Regression Analysis
Social support among older adults in Malaysia

Mahmud MA, Hazrin M, Muhammad EN, Mohd Hisyam MF, Awaludin SM, Abdul Razak MA, et al.

Geriatr Gerontol Int, 2020 Dec;20 Suppl 2:63-67.
PMID: 33370852 DOI: 10.1111/ggi.14033

AIM: This study aimed to determine the factors that influence perceived social support among older adults in Malaysia.
METHODS: We used the 11-item Duke Social Support Index to assess perceived social support through a face-to-face interview. Higher scores indicate better social support. Linear regression analysis was carried out to determine the factors that influence perceived social support by adapting the conceptual model of social support determinants and its impact on health.
RESULTS: A total of 3959 respondents aged ≥60 years completed the Duke Social Support Index. The estimated mean Duke Social Support Index score was 27.65 (95% CI 27.36-27.95). Adjusted for confounders, the factors found to be significantly associated with social support among older adults were monthly income below RM1000 (-0.8502, 95% CI -1.3523, -0.3481), being single (-0.5360, 95% CI -0.8430, -0.2290), no depression/normal (2.2801, 95% CI 1.6666-2.8937), absence of activities of daily living (0.9854, 95% CI 0.5599-1.4109) and dependency in instrumental activities of daily living (-0.3655, 95% CI -0.9811, -0.3259).
CONCLUSION: This study found that low income, being single, no depression, absence of activities of daily living and dependency in instrumental activities of daily living were important factors related to perceived social support among Malaysian older adults. Geriatr Gerontol Int 2020; 20: 63-67.

Matched MeSH terms: Regression Analysis
Fulltext FACTORS INFLUENCING CONSUMERS IN USING SHOPEE FOR ONLINE PURCHASE INTENTION IN EAST COAST MALAYSIA

KIEW CHEE CHING, ZUHA ROSUFILA ABU HASAN, NADIA ABU HASAN

UMT Journal of Undergraduate Research, 2021;3(1):45-56.
MyJurnal

Shopee online has become increasingly popular among consumers for purchasing purposes as compared to brick-and-mortar retail due to the benefits and enjoyment that come with it. However, Shopee has facing intense competitive challenges with other competitors in Malaysia. In addition, it is also difficult for Shopee to compete with major leader of online shopping portal although this platform offers the same function and usage as its contender. Hence, it is important to understand consumer perceptions on the benefit and intention of using Shopee. This study examines consumer perceived usefulness, perceived ease of use, perceived price, perceived convenience and perceived trust adapted from the Technology Acceptance Model (TAM). 208 respondents who have experience online purchasing in East Cost of Malaysia were invited to participate in this study using online survey. Data were analyzed using descriptive, correlation and multiple regression analyses. The findings show that perceived convenience and perceived trust have strong influence towards consumer intention to use Shopee as platform to do online purchase. It is suggested that this study will help practitioners to understand consumer online shopping perception and intention in order to induce visitation and usage of Shopee.

Matched MeSH terms: Regression Analysis
Fulltext DETERMINANT FACTORS OF ENTREPRENEURIAL INTENTIONS AMONG UNIVERSITY STUDENTS IN TERENGGANU

NUR ERNA ERLIANA SAMSUDIN, AZWADI ALI, ROSHAIZA TAHA

UMT Journal of Undergraduate Research, 2020;2(4):51-62.
MyJurnal

This study was conducted to assess how entrepreneurship experience, family background, and societal factors influence university students in Terengganu to embark on entrepreneurial activities. It cannot be denied that entrepreneurship exposure on campus may drive university students to engage in activities which may enhance their academic achievements in, boost confidence, and instill relevant qualities and skills to be successful graduates in the future. Such valuable experiences may be value added to the graduates. To see the impact of such an experience together with other relevant factors, this study has tested the relationship between entrepreneurship experience, family background, social factors and the subsequent effects among students of Universiti Malaysia Terengganu after graduation. The data were collected from 370 targeted respondents and were analysed using the multiple regression analysis. It was found that entrepreneurship experience and family background have significant relationships with entrepreneurship intention while societal factor was found to be insignificant.

Matched MeSH terms: Regression Analysis
Fulltext A study to identify environmental health indicators within the Langat basin ecosystem

Jamal Hisham Hashim, Ruzita Shariff, Dayang Aminah Ali, Mohd Hasni Jaafar, Mazlin Mokhtar

Malaysian Journal of Public Health Medicine, 2002;2(2):36-42.
MyJurnal

Indicators, whether referred to as ecological, biological or environmental, help us in assessing environmental conditions. Hypothetically, joint influences are predicted of the parameters associated with the number of water-borne, food-borne and vector-borne cases in study areas. Regression analysis of the dependent variables in water—borne diseases such as Cholera, Typhoid, Dysentery and Hepatitis indicated that the total coly°orm, fecal colform, residual chlorine, mean monthly rainfall and temperature influence almost hay of the cases in the 3 District of Serernban. Thus, coordinated monitoring of physical, chemical and biological parameters is needed to continue to build databases and to develop models integrating environnrental and social conditions, consequences and costs.

Matched MeSH terms: Regression Analysis
Fulltext Bioactive Molecule Prediction Using Extreme Gradient Boosting

Babajide Mustapha I, Saeed F

Molecules, 2016 Jul 28;21(8).
PMID: 27483216 DOI: 10.3390/molecules21080983

Following the explosive growth in chemical and biological data, the shift from traditional methods of drug discovery to computer-aided means has made data mining and machine learning methods integral parts of today's drug discovery process. In this paper, extreme gradient boosting (Xgboost), which is an ensemble of Classification and Regression Tree (CART) and a variant of the Gradient Boosting Machine, was investigated for the prediction of biological activity based on quantitative description of the compound's molecular structure. Seven datasets, well known in the literature were used in this paper and experimental results show that Xgboost can outperform machine learning algorithms like Random Forest (RF), Support Vector Machines (LSVM), Radial Basis Function Neural Network (RBFN) and Naïve Bayes (NB) for the prediction of biological activities. In addition to its ability to detect minority activity classes in highly imbalanced datasets, it showed remarkable performance on both high and low diversity datasets.

Matched MeSH terms: Regression Analysis
Fulltext Differentiation of ripe banana flour using mineral composition and logistic regression model

Abbas F.M.A., Saifullah, R., Azhar, M.E.

International Food Research Journal, 2009;16(1):83-87.
MyJurnal

Cavendish (Musa paradisiaca L, cv cavendshii) and Dream (Musa acuminata colla. AAA, cv ‘Berangan’) banana flours were prepared from ripe fruits collected from eleven markets located in Penang, Malaysia. The mineral composition (Na, K, Ca, Mg, Cu, Fe, Mn, Zn) of the flour were analyzed by atomic absorption spectrophotometer and the data obtained were analyzed using logistic regression model. Ripe banana flours were rich source of K and a fair source of other minerals, however logistic regression model identified Mg as an indicator to discriminate between the two types of banana flour affording 100 % correct assignation. Based on this result, mineral analysis may be suggested as a method to authenticate ripe banana flour. This study also presents the usefulness of logistic regression technique for analysis and interpretation of complex data.

Matched MeSH terms: Regression Analysis
Fulltext The timing and sequence of emergence of permanent teeth in Malay school children in Kota Bharu, Malaysia

Hussin, A.S., Mokhtar, N., Naing, L., Taylor, J.A., Mahmood, Z.

Archives of Orofacial Sciences, 2007;2(1):36-40.
MyJurnal

The purpose of this study was to determine the timing and sequence of emergence of the first 28 permanent teeth in a cross-section of Malay children in the district of Kota Bharu, in northeastern Peninsula Malaysia. The sample consists of 478 boys and 908 girls of Malay descent aged between 5-19 years. The criterion for tooth emergence was the appearance of the tooth through the gingivae. Descriptive statistics were calculated and probit regression analysis performed to determine the mean age of emergence of the permanent dentition. The mean age at emergence was found to conform to general trends, with emergence seen earlier in girls than in boys. Comparisons were made with the Chinese (Hong Kong) and the Punjabi (Chandigarh) profiles, which showed earlier emergence timings in those ethnic groups. The emergence timing in Malays, however, was earlier than in Thais (Central Thailand). The sequence of emergence was determined by referring to the mean age of tooth emergence of individual teeth and conforms to the general trend seen in other studies.

Matched MeSH terms: Regression Analysis
Fulltext Factors associated with organizational stress among intensive care unit healthcare workers, in Somalia hospital

Hussein, J., Aniza, I., Ahmad Taufik, J.

Malaysian Journal of Public Health Medicine, 2012;12(1):57-66.
MyJurnal

A cross-sectional study was conducted in two hospitals in Hargeisa city to determine the job and organizational stress among nurses and doctors in ICU and its influencing factors. A universal sampling method was carried out and one hundred and twenty questionnaires were distributed among nurses and doctors working in intensive care units of two hospitals on different shift duties; morning, afternoon, night and rotation shifts. The response rate was 83.3%. Regression analysis showed that approximately 88% (adjusted R square = 0.889) of the variation in stress mean score was explained by the background variables. Experience, role overload, physical environment and marital status were significant predictors.

Matched MeSH terms: Regression Analysis
Neurobehavioral performances among lead exposed workers in Malaysia: an early detection of lead toxicity

Mazrura Sahani, Noor Hassim Ismail

Journal of Occupational Safety and Health, 2005;2(1):1-9.
MyJurnal

The objectives of this study is to evaluate subjective symptoms and neurobehavioral performances among workers exposed to lead and its relation with blood lead levels. The methodology of this study was restricted to 141 Malaysian battery manufacturing factories male workers with mean (SD) age of 35.2 (9.6) years, years of employment 9.1 (7.1), current blood lead concentration 40.5 (16.8) μg/dl were given WHO neurobehavioral core test battery. Results showed that highly exposed group blood lead level (high ≥ 40 μg/dl) performed less well in 4 of 13 responses reported higher subjective symptoms of weakness of lower limbs and anorexia. Significant correlation was found between blood lead and Digit Symbol, Digit Forward, Digit Backward, Aiming Pursuit Test and Trail B. Regression analysis showed reduction in cognitive, memory and concentration functions at ≤ 30 μg/dl blood lead levels with maximum lead effect at Digit symbol’s score at 40 μg/dl. In conclusion, this study is consistent with the larger body of neurobehavioral tests in lead exposure and has proven the ability of these tests in detecting low level of lead toxicity.

Matched MeSH terms: Regression Analysis
Fulltext Impact of decomposition of autonomic tonic and phasic responses on predictors of reaction performance in elite Malaysian swimmers

Saha, Srilekha, Saha, Soumendra

Movement Health & Exercise, 2014;3(1):15-25.
MyJurnal

Psychobiological predictors of emotionality were evaluated in relations to complex reaction and movement performances have been considered as the significant aspect of research interest. Considerable research base confirms that the expert players employ more pertinent search strategies, eliminate irrelevant cues which enable them to effectively anticipate action requirements and they have superior ability to use cue-related information to reliably anticipate occurrence of relevant events. Present study was aimed at identification of intricate relationship between the ability of the high performing swimmers (National - level swimmers of Malaysia) in anticipatory cue-utilization and corresponding autonomic phasic skin conductance responses isolated from the tonic measures. Altogether two-hundred and twenty-five individuals having high athletic calibre, and holding top-positions in recently held (within the period March 2011 up to the June 2011) National and International (Mostly ASEAN level) meets volunteered as the participants in this study. Simultaneous evaluation of autonomic arousal modulation (habituation paradigm tonic and phasic measures of skin conductance) was done when the swimmers were engaged in cue-related anticipatory task, associated with complex reaction performance. For this purpose, participants were evaluated intermittently (twice within the calendar year August 2010 - June 2011) with the identical research paradigm. Perceived sense of competence as well as the subjective feelings of apprehension of loosing was explored, and attempts were made to identify the obscure subjective expression of cognitive-emotional make-up, in explaining differential performance outcomes evident in the participants. Findings of multiple linear and polynomial regression analyses however suggested direct, inverse and supportive relationships between decomposition of skin conductance tonic and phasic autonomic components related to cognitive-affective and affective motivational aspects of sports behaviour explaining pathways to both excellent and debilitative performance outcomes during practice sessions as well as in actual competitive situations.

Matched MeSH terms: Regression Analysis
Fulltext The Relationship amongst Intervertebral Disc Vertical Diameter, Lateral Foramen Diameter and Nerve Root Impingement in Lumbar Vertebra

Yusof MI, Hassan MN, Abdullah MS

Malays Orthop J, 2018 Mar;12(1):21-25.
PMID: 29725508 MyJurnal DOI: 10.5704/MOJ.1803.004

Introduction: The vertical diameter of the foramen is dependent upon the vertical diameter of the corresponding intervertebral disc. A decrease in disc vertical diameter has direct anatomic consequences to the foraminal diameter and area available for the nerve root passing through it. This study is to establish the relationship amongst the intervertebral disc vertical diameter, lateral foramen diameters and nerve root compression in the lumbar vertebra. Materials and Methods: Measurements of the study parameters were performed using sagittal MRI images. The parameters studied were: intervertebral disc vertical diameter (DVD), foraminal vertical diameter (FVD), foraminal transverse diameter (FTD) and nerve root diameter (NRD) of both sides. The relationship between the measured parameters were then analyzed. Results: A total of 62 MRI images were available for this study. Statistical analysis showed moderate to strong correlation between DVD and FVD at all the lumbar levels except at left L23 and L5S1 and right L3L4 and L4L5. Correlation between DVD and FTD were not significant at all lumbar levels. Regression analysis showed that a decrease of 1mm of DVD was associated with 1.3, 1.7, 3.3, 3.3 and 1.3mm reduction of FVD at L1L2, L2L3, L3L4, L4L5 and L5S1 respectively. Conclusion: Reduction of DVD was associated with reduction of FVD. However, FVD was relatively wide for the nerve root even with complete loss of DVD. FTD was much narrower than the FVD making it more likely to cause nerve root compression at the exit foramina. These anatomical details should be given consideration in treating patients with lateral canal stenosis.

Matched MeSH terms: Regression Analysis

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