مرکز منطقه ای اطلاع رساني علوم و فناوري - تعيين مناسب ترين حدود مرزي دور كمر براي تشخيص چاقي و چاقي شكمي در جامعه شهرنشين تهران : مطالعه قند و ليپيد تهران

چكيده لاتين :

Introduction: Obesity and central obesity are the most important predictors of non-communicable diseases. Based on previous studies, cutoff values for waist circumference can detect both of them. This study was conducted to assess the sensitivity and specificity of recommended cutoff values for waist circumference and to determine the optimal cut-off values to detect obesity and central obesity in an urban population of Tehran. Materials and Methods: From among the 15005 participants of Tehran Lipid and Glucose Study (TLGS) aged 3-70 years, all 4306 men and 5762 women aged 20 years and over were included in this study. Waist and hip circumferences, height and weight were measured and body mass index (BMl) and waist to hip ratio (WHR) were calculated. Waist circumferences equal or over 94 cm in men and equal or over 80 cm in women were considered as waist action level 1 (people whose health risks were increased and should gain no further weight), and equal or over 102 cm in men and equal or over 88 cm in women were considered as waist action level 2 (high risk people that should reduce their weight). Specificity and sensitivity of these waist action levels to detect both overweight (BMI >=25kg/m) or obesity (BMI >= 30kglm2) and central obesity (WHR z 0.95 in men and z 0.80 in women) were calculated. To estimate the optimal cut-off values for waist circumference for detecting both obesity and central obesity, Roc-curve analysis was used. Results: Mean±SD of waist circumferences were 88.5±11.4 and 87.7±12.9 cm in men and women, respectively (p<0.01). The prevalence of central obesity, based on recommended WHR cut-off values was 33.0% in men and 67.2% in women (p<0.001). The prevalence of overweight in men was 42.6% and in women it was 38.1%, whereas the prevalence of obesity was 14.4% in men, and 29.5% in women. The findings revealed that 33.3% of men and 72.7% of women were categorized as waist action level I and 11.7% of men and 50.3% of women were grouped as waist action level 2. Specificities of both action levels were above 95%; however, sensitivities of waist action levels 1 and 2 were 55% and 31% in men and 88% and 70% in women, respectively. Optimal cut-off values for waist action levels I and 2 were estimated to be 85 and 90 cm for men and 75 and 80 cm for women, respectively. Conclusion: Considering the low sensitivity and specificity of recommended waist action levels to detect both obesity and central obesity in Tehran men, application of these cut-off values for this population may not be suitable and further studies to determine optimum cut-off values are recommended.