Displaying publications 1 - 20 of 1041 in total

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  1. West KM, Kalbfleisch JM
    Diabetes, 1971 May;20(5):289-96.
    PMID: 5581317 DOI: 10.2337/diab.20.5.289
    The sensitivity and specificity of each of five screening tests were estimated in each of three to ten countries by testing subjects drawn from the general populations of adults over thirty-four years of age. This permitted comparisons among countries and among the different tests (fasting, postprandial, and postglucose urine tests, and fasting and postprandial blood glucose values). Sensitivity and specificity of each test varied widely among populations. For example, the sensitivity of the two-hour urine glucose ranged from 17 per cent in Nicaragua to 100 per cent in East Pakistan. Apparently specificity and sensitivity of such tests are influenced by many factors including both the circumstances under which the tests are performed and the characteristics of the population tested. It is, therefore, not possible to predict prevalence rates reliably by extrapolating from the results of screening tests. However, we believe the data for specific populations on the sensitivity and specificity of various tests will provide a rough guide in predicting the cost-effectiveness of alternative approaches to case detection in those particular countries. For instance, these results suggest that roughly 56 per cent of the occult diabetics in Costa Rica in this age group would be detected by a two-hour urine glucose, but only about 41 per cent of those in whom this test was positive would prove to have diabetes. Even modest changes of criteria in defining either "diabetes" or "abnormality" of the screening results produced marked changes in rates of sensitivity and specificity. With few exceptions, tests which were more sensitive were, comparably, less specific, and the reverse was also true. Rates of "diabetes" were markedly influenced by modest changes in diagnostic criteria.
    Matched MeSH terms: Sensitivity and Specificity*
  2. Ng TKW
    Med J Malaysia, 1984 Mar;39(1):28-34.
    PMID: 6439983
    Correlation analysis of mid-arm circumference (MAC), weight-for-age and weight-for-height obtained from 807 Malay preschool children aged 12-71 months show that MAC had a relatively low correlation with weight-for-age (r = 0.59, P <0.001) and weight-for-height (r = 0.63, P<0.001). MAC percentiles and sensitivity-specificity analysis indicate that when weight-for-age and weight-for-height were used separately to define 'true' malnutrition, MAC was not sensitive enough to detect Malaysian children with only mild to moderate protein-energy malnutrition (PEM). The value of MAC as a screening measure in malnutrition is only limited to identifying the more severe forms of PEM in young children and the present study indicates that a MAC of 13.0-13.7 cm may be used for identifying moderate to severe PEM and under 13.0 cm for severe PEM.
    Matched MeSH terms: Sensitivity and Specificity
  3. Ngen RMY, Cheong I, Yahaya O
    Med J Malaysia, 1985 Jun;40(2):98-100.
    PMID: 3834293
    405 cases of bronchial brushing cytology were evaluated for its effectiveness in detecting pulmonary carcinoma. Cytohistologic findings were correlated whenever endoscopic biopsies were performed. Sputum cytological investigations were also included in this paper to examine the total diagnostic sensitivity of all the three methods combined.
    Matched MeSH terms: Sensitivity and Specificity
  4. Ho TM, Yit YH, Husain M
    Asian Pac J Allergy Immunol, 1988 Dec;6(2):103-6.
    PMID: 3146256
    Allergy to Dermatophagoides pteronyssinus was determined in 61 rhinitis patients using prick test (PT), enzyme-immunoassay (EIA) and enzyme-linked immunosorbent assay (ELISA). A total of 43 patients tested positive with PT. Forty six patients were positive when tested with EIA and ELISA. With PT as standard test, EIA was found to have 83.7% sensitivity and 44.4% specificity; ELISA had 81.4% sensitivity and 38.9% specificity. There was a linear relationship between absorbance values obtained by EIA and ELISA. The performance time was 8 hours, 24 hours and 30 minutes for ELISA, EIA and PT respectively. The cost per test for ELISA, EIA and PT was US$ 0.20, US$ 5.20 and US$ 0.14 respectively. It was concluded that ELISA was more cost-effective than EIA should be used to supplement PT for a more complete diagnosis of allergy.
    Matched MeSH terms: Sensitivity and Specificity
  5. Kudva MV, Zawawi M, Rafee N, Ismail O, Muda JR
    Med J Malaysia, 1989 Sep;44(3):236-42.
    PMID: 2626138
    The objective of the study was to determine whether discriminant analysis of characteristics of dyspepsia can differentiate peptic ulcer from non-ulcer dyspepsia in a Malaysian population. Two hundred and twenty six patients with dyspepsia were interviewed using a standard history questionnaire before undergoing upper gastrointestinal endoscopy. Forty seven patients had peptic ulcer while 149 others were classified as having non-ulcer dyspepsia. Stepwise logistic regression analysis was done on 25 variables. The study showed that only five of these variables could differentiate peptic ulcer from non-ulcer dyspepsia, namely, nocturnal pain, pain before meals or when hungry, absence of nausea, age and sex. A scoring system was devised based on these discriminant symptoms. At a sensitivity of 51%, the specificity for peptic ulcer was 83%, but only prospective studies will determine if this scoring system is of actual clinical value.
    Matched MeSH terms: Sensitivity and Specificity
  6. Thoe SY, Sam CK, Cheng HM, Prasad U
    J Med Virol, 1989 Dec;29(4):311-4.
    PMID: 2559955
    Serum antibodies against Epstein-Barr virus (EBV)-determined antigens have traditionally been titrated by the indirect immunofluorescence (IIF) technique. The avidin-biotin complex (ABC) immunocytochemical technique was used to determine the serum levels of IgA against EBV viral capsid antigen (IgA/VCA) and IgA against EBV early antigen (IgA/EA) in sera of 106 nasopharyngeal carcinoma (NPC) patients prior to treatment and 100 normal individuals. The sensitivity of the ABC technique is enhanced by an amplification of the antigen-antibody reaction, which involves the binding of the enzyme-linked ABC to the second biotinylated antibody. There was a good correlation (r = 0.9988) between ABC and IIF-determined IgA/VCA-positive titres, with the ABC technique being more sensitive than IIF in the detection of IgA/VCA in NPC sera: 94% (99/106) and 76% (80/106), respectively. The frequency of IgA/EA reactivity in NPC sera was also markedly increased by immunodetection with the ABC technique as compared with IIF technique: 63% (69/106) and 28% (30/106) respectively. Both the immunocytochemical techniques were equally specific in discriminating between elevated serum titres of IgA/VCA and IgA/EA in NPC sera from normal human sera.
    Matched MeSH terms: Sensitivity and Specificity
  7. Karim QN, Finn GY, Easmon CS, Dangor Y, Dance DA, Ngeow YF, et al.
    Genitourin Med, 1989 Dec;65(6):361-5.
    PMID: 2693334
    A monoclonal antibody raised against Haemophilus ducreyi was tested for its sensitivity and specificity as an immunofluorescence (IF) reagent using simulated vaginal smears containing H. ducreyi, smears taken from skin lesions of mice infected with H. ducreyi and patients from South Africa, Thailand and Malaysia with clinically diagnosed chancroid. The IF test was more sensitive than culture or Gram staining in the simulated smears, theoretically detecting less than 4 organisms/sample. It detected H. ducreyi in 95% of the animal lesions compared with 14% detected by culture. Immunofluorescence testing identified over 90% of culture-positive cases of chancroid but also detected organisms in some culture-negative cases where clinical evidence for the diagnosis was strong. These results suggest that this antibody may provide a simple, rapid and sensitive means of detecting H. ducreyi in cases of chancroid.
    Matched MeSH terms: Sensitivity and Specificity
  8. Ali O
    Family Physician, 1989;1(1):42-43.
    The validity of the 2-hour post-prandial (2HPP) urine glucose was determined among a Malay community in Kuala Selangor. Fifty glycosuric and 80 non-glycosuric samples had their capillary blood glucose and fasting blood sugar tested to determine their diabetic status. It was found that the test was very sensitive but less specific (sensitivity 100% and specificity 72.1%). Samples with 2HPP urine glucose of 3 + had a higher probability of being diabetic than the others.
    Matched MeSH terms: Sensitivity and Specificity
  9. Cheong YM, Jegathesan M, Ansary A, Othman M
    Med J Malaysia, 1990 Mar;45(1):42-8.
    PMID: 2152068
    The prevalence of Enterotoxigenic Escherichia coli (ETEC) in 433 stool samples from diarrhoeal cases of all ages was studied using two commercially available test kits for the detection of heat labile toxin (LT) and the infant mouse assay for the heat stable toxin (ST). 16 samples (3.7%) were positive for ETEC, of which nine were producing ST alone, six LT alone and only one was producing both LT and ST. Although the percentage of isolation rate was low, its occurrence was almost as common as the Shigella spp and Salmonella spp in the same study. Of the two test kits examined, the Phadebact ETEC-LT Test 50 (Pharmacia Diagnostics, Uppsala, Sweden) was found to be more suitable for use in a routine diagnostic laboratory. Ten out of 12 (83%) of the strains tested were resistant to one or more antibiotics.
    Matched MeSH terms: Sensitivity and Specificity
  10. Teoh SL, Allan D, Dutton GN, Foulds WS
    Br J Ophthalmol, 1990 Apr;74(4):215-9.
    PMID: 2186795
    The visual acuity, the difference in sensitivity of the two eyes to light (brightness ratio), and contrast sensitivity were assessed in 28 patients with chronic open angle glaucoma and compared with those of 41 normal controls of similar ages and visual acuity. The results obtained were related to the results of Tübingen visual field analysis in patients with glaucoma. Twenty-four of the 28 glaucoma patients (86%) had a significant disparity in brightness ratio between the two eyes. This was found to match the frequency of visual field loss. Moreover, there was a significant relationship between the interocular differences in brightness sense and the difference in the degree of visual field loss between the two eyes. Of the glaucoma patients 39% had sum contrast sensitivities outside the normal range for age-matched normal controls. No significant correlation was found between the interocular difference in brightness sense and the visual acuity or the interocular difference in sum contrast sensitivity. It is concluded that, in the presence of a normal visual acuity, the brightness ratio test warrants evaluation as a potential screening test for chronic open angle glaucoma.
    Matched MeSH terms: Sensitivity and Specificity
  11. Yaacob I, Ahmad Z
    Med J Malaysia, 1990 Sep;45(3):231-4.
    PMID: 2152084
    The value of tuberculin skin testing in the diagnosis of active tuberculosis remains uncertain. Interpretation of tuberculin tests would be easier if the tuberculin test profiles in different communities were accurately known. We reviewed 468 Mantoux test reactions in patients coming to Hospital Universiti Sains Malaysia with suspected tuberculosis. Eighty six percent of patients with active tuberculosis had a positive Mantoux test. Forty two percent of the cases of positive Mantoux test did not have evidence of active tuberculosis. Most of these cases had evidence of past infection with tuberculosis. We conclude that Mantoux test is a sensitive but a non-specific test in the diagnosis of active tuberculosis.
    Study site: outpatients, inpatients; Hospital Universiti Sains Malaysia, Kubang Kerian, Kelantan, Malaysia
    Matched MeSH terms: Sensitivity and Specificity
  12. Quek DK, Pung LY
    Med J Malaysia, 1990 Sep;45(3):208-19.
    PMID: 2152082
    Cardiac complications comprise as much as 50% of perioperative vascular surgical morbidity and mortality. Using the Goldman multifactorial index for evaluating cardiac risk pre-operatively, 53 consecutive patients who underwent abdominal aortic aneurysm surgery were prospectively studied. Forty patients (75.5%) were also evaluated with echocardiography for assessment of left ventricular function. There were 14 (23.7%) peri-operative events, of which nine (17.0%) were acute myocardial infarctions--two of whom died (3.8%). The minor complications included three with hypovolaemic renal failure, and one each with acute respiratory failure and cerebrovascular accident. Patients with Goldman cardiac risk index (CRI) classes III and IV were associated with significantly higher risks of peri-operative complications (p less than 0.001), i.e. 77.8% and 66.7% respectively, compared with class II (22.7%) and class I (nil). Echocardiographic left ventricular shortening fraction (LVFS) of less than 28% helped identify high risk groups in all classes, although its positive predictive value was low (42.3%). Combining LVFS less than 28% with Goldman CRI categories II to IV improved the sensitivity to 91.7% and the positive predictive value to 61.1%. Careful pre-operative assessment using the simple Goldman index and echocardiography is helpful in identifying higher risk patients who would benefit from pre-operative stabilisation and more rigorous perioperative hemodynamic monitoring preferably including intensive care (ICU) management, so as to reduce cardiac complications.
    Matched MeSH terms: Sensitivity and Specificity
  13. Salleh MR
    Singapore Med J, 1990 Oct;31(5):457-62.
    PMID: 2259943
    A validated study of the Self-Reporting Questionnaire (SRQ-20) of the World Health Organization against ICD-9 was found to have good validation indices at the cut-off point of 5/6. The sensitivity was 84.8% and specificity 83.7%. However, SRQ-24 had poor validation indices and are too sensitive to detect psychotic illness. Twenty-three per cent of 264 schizophrenic relatives who had been staying together with them and or actively involved in their care for at least one year had neurotic disorders compared with 1% who had latent schizophrenia. The prevalence of psychiatric morbidity was higher in the first-degree relatives compared with non-first degree relatives.
    Matched MeSH terms: Sensitivity and Specificity
  14. Cardosa MJ, Zuraini I
    PMID: 1818383
    This study describes the use of an IgM capture ELISA using cell culture derived antigens and a polyclonal rabbit antiflavivirus antisera for the detection of dengue positive cases. The IgM capture ELISA is compared with the dot enzyme immunoassay and the results are discussed in the context of dengue endemicity.
    Matched MeSH terms: Sensitivity and Specificity
  15. Ismail Y
    Med J Malaysia, 1992 Mar;47(1):69-73.
    PMID: 1387454
    To assess the prevalence of skin test sensitivity among asthmatic patients in Malaysia, skin prick tests for allergy in 134 adult asthmatic patients and 120 control subjects were done. 90% of asthmatic patients had positive skin test to at least one allergens as compared to 78% of the controls. House dust mite was the most frequent allergen to which the subjects had positive reactions. Sixty-four percent of the asthmatic patients had associated rhinitis. There was no significant difference in the skin test sensitivity between asthmatic patients with associated rhinitis and those without.
    Matched MeSH terms: Sensitivity and Specificity
  16. Yap SF, Peh SC, Chan L, Wong HC, How VJ, Looi LM
    PMID: 1355930
    A serological investigation for human T cell leukemia virus I (HTLV-I) infection was carried out at the University Hospital, Kuala Lumpur. A total of 626 sera from a non-patient population and 1,038 sera from unselected in-patients were screened for HTLV-I antibodies using an enzyme-linked immunosorbent assay (ELISA). 27/1664 (1.6%) were found to be reactive. However, on Western blotting, only 2 sera were confirmed positive, both showing reactions for the major core (p19 and p24) and the envelope (gp46) proteins. Both of the serum samples were from unselected hospital patients. Most of the remaining sera which were reactive on screening showed indeterminate results on Western blotting. These were further tested by radioimmunoprecipitation assay (RIPA) and none of these sera gave a positive reaction. Therefore, only 2/1038 (0.19%) unselected patients could be confirmed to have antibodies to HTLV-I. None of the normal individuals screened showed a positive Western blot result. Our data indicate that HTLV-I infection is present in our population, but at a low prevalence rate.
    Matched MeSH terms: Sensitivity and Specificity
  17. Ho TM, Shara S, Koay AS, Cheong YM
    J Med Entomol, 1992 Jul;29(4):611-3.
    PMID: 1495069
    A dot-immunobinding assay (DIBA) was compared with a direct fluorescent antibody technique (DFAT) for the detection of Rickettsia tsutsugamushi infection in Leptotrombidium fletcheri (Womersley & Heaslip). Laboratory colonies of infected and noninfected chiggers were examined. The relative proportions of positive, negative, and indeterminate results were significantly different between DIBA and DFAT for infected but not for noninfected chiggers. DIBA was more sensitive and had a better negative predictive value and a lower false negative percentage than DFAT. It was concluded that DIBA is a suitable alternative to DFAT for detecting scrub typhus infection in chiggers.
    Matched MeSH terms: Sensitivity and Specificity
  18. Mak JW, Normaznah Y, Chiang GL
    Singapore Med J, 1992 Oct;33(5):452-4.
    PMID: 1455266
    The quantitative buffy coat (QBC) technique was compared with the conventional thick blood film technique in a malaria survey carried out in a mesoendemic area of malaria in Betau, Pahang, Malaysia. The QBC technique was found to be a rapid technique but had a sensitivity of about 56% and a specificity of 95%, using the thick blood film method as the "gold standard". Malaria species identification was unsatisfactory with the QBC technique as it could identify parasites correctly in only about 60% of specimens. It was unable to detect as positive about 58% of specimens which had parasite counts < or = 500 per ul but could detect about 94% of those with counts > 500 per ul. This difference in positive detection rate was significantly different (p < 0.05). It cannot quantify parasitemia easily and the specimens cannot be stored for future reference and for quality control purposes. It is therefore concluded that the QBC technique cannot replace the classical thick blood film technique for use in malaria control programmes. Its use may be appropriate in situations like busy blood banks and outpatient clinics where rapid screening of malaria infection is needed but where experienced malaria microscopists may not be available.
    Matched MeSH terms: Sensitivity and Specificity
  19. Yap KL, Ooi YE, Khor CM, Wong SH
    Malays J Pathol, 1992 Dec;14(2):105-10.
    PMID: 1338997
    The group A rotavirus staphylococcal co-agglutination test was evaluated and its sensitivity and specificity compared with an in-house enzyme-linked immunosorbent assay (ELISA) and a commercial latex agglutination test (Rotalex). In addition, the storage stability of the staphylococcal reagents was ascertained. Examination of 136 clarified suspensions of diarrhoeal faeces by the staphylococcal co-agglutination test revealed a high proportion of false positives (26%) and uninterpretable results (34%) due to non-specific agglutination. Non-specific agglutination could be removed effectively by prior absorption of the clarified faecal specimens with unsensitized staphylococci. The staphylococcal co-agglutination test was less sensitive and specific than the in-house enzyme-linked immunosorbent assay but was comparable to the Rotalex slide latex agglutination test. The staphylococcal reagents have a shelf life of at least 29 weeks.
    Matched MeSH terms: Sensitivity and Specificity
  20. Fang R, Sinniah M, Kuen LS
    Malays J Pathol, 1992 Dec;14(2):117-20.
    PMID: 1304624
    Dengue fever/Dengue haemorrhagic fever (DF/DHF) has been a public health problem in Malaysia with an endemic level of about 7 per 100,000 population per year. In 1990, Malaysia experienced its most severe outbreak of DF/DHF with a record total of 5,590 cases referred to the Division of Virology, Institute for Medical Research (IMR). Of these, 1,880 were confirmed serologically to be DF/DHF. The conventional serological procedure, the Haemagglutination Inhibition (HI) test, for the diagnosis of DF/DHF is cumbersome and causes delay in diagnosis. Another problem associated with the HI test has been that it has often been difficult to obtain a second convalescent serum sample for an accurate diagnosis. This has raised an urgent need to establish a "rapid" test for diagnosis of DF/DHF. As such the authors recently carried out an evaluation of a newly available commercial rapid test, namely, the Dengue Blot Assay (Diagnostic Biotechnology Singapore Pte Ltd). The test is intended for use in laboratory confirmation of dengue virus infection. The evaluation was to determine if the test could be utilised as a routine laboratory test and to establish its sensitivity and specificity. Over 400 samples were tested against the Dengue Blot Assay. Results were checked against an in-house Dengue IgM ELISA and HI assay. Preliminary results indicate that the sensitivity and specificity of the Dengue Blot is satisfactory. Our results also indicate that the Dengue Blot has a useful role to play in a routine laboratory especially since it provides rapid results on single serum samples thereby reducing the workload in a busy diagnostic laboratory.
    Matched MeSH terms: Sensitivity and Specificity*
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