Showing 2 results for Specificity
Massoud Amini, Mehrdad Hosseinpour, Gashtasb Sattari, Sasan Haghighi,
Volume 1, Issue 1 (7-2001)
Abstract
Background: Oral glucose tolerance testing (OGTT) is the gold standard for the diagnosis of diabetes mellitus and impaired glucose tolerance (IGT), but is time-consuming and difficult to perform. We investigated the value of glycosylated hemoglobin (HbA1C) in screening for diabetes mellitus and IGT.
Methods: In a cross-sectional study, we measured the HBA1C levels of 497 people referred for OGTT. We calculated the sensitivity and specificity of HbA1C at 1, 2, 3 and 4 SD above the normal mean. We plotted receiver operating characteristic (ROC) curves after assigning our subjects to the diabetic, IGT, ‘diabetic+IGT’, or normal group, based on WHO criteria for OGTT.
Results: HbA1C levels (mean ± SD) in the four groups were 9.2±1.5, 8.4±1.3, 7.9±0.8 and 6.8±0.7 percent in the diabetic, diabetic+IGT, IGT and normal groups, respectively. All differences were statistically significant (p<0.0001). ROC curve analysis showed that HbA1C levels above 7.5% (mean + 1SD) gave the best combination of sensitivity and specificity for the detection of diabetes (97.53% and 73.8%), IGT (66.37 and 69.44%), and diabetes+IGT (80.22% and 86.66%).
Conclusions: An HbA1C level of >7.5% is an optimal cutoff point for diabetes screening programs.
Farshad Sharifi, Neda Nazari, Shervan Shoaee, Hassan Ahmadi, Marjan Asadollahi, Seyed Masoud Arzaghi, Mahtab Alizadeh Khoee, Hossein Fakhrzadeh,
Volume 16, Issue 4 (9-2017)
Abstract
Background: Although several tools for evaluating and screening of cognitive status have been introduced, most of them are not applicable in Iranian elderly population because of cultural differences and high illiteracy rate. This study is report of "Brief Cognitive Assessment Tool"(BCAT) was developed as a cognitive status-evaluating test and reported psychometric characteristics.
Methods: the BCAT tool includes memory assessment using three words recall test with a rating similar to Mini-Cog and the functional status including "ability to dress", "ability to use the phone," " ability to manage own medications", among both two sexes and financial management capabilities in men and ability to prepare food in women. Functional rating is different in educated and non-educated people. Diagnosis of dementia is considered, when memory impairment is accompanied by the dysfunction. Eighty-six residents of a nursing home (41 men and 45 women) among who had inclusion and no had exclusion criteria also consent to participate were randomly enrolled. Concurrent validity was shown as correlation coefficient between the BCAT categorization and score of mini meAntal state examination (MMSE). Criterion validity, sensitivity and specificity of BCAT were evaluated based on global deterioration scale (GDS). Reliability of two raters results within two weeks was indicated by Kappa coefficient.
Results: The sensitivity and specificity and accuracy rate of the BCAT based the GDS was 88.6%, 82.6%, and 84.9%, respectively. The correlation between the MMSE score and results of the BCAT classifying was significant. The Kappa coefficient between the results of two raters was 81.1%.
Conclusion: It seems that the BCAT has good psychometric properties to recognize cognitive impairment among Iranian older adults.
