The 10-year cumulative incidence of diabetes was calculated according to NCEP-ATPIII waist categories, stratified by BMI (normal weight, overweight, obese), sex, and age group (40 49, 50 59, 60 69 years), as the cumulative number of cases at 10 years of follow-up divided by the total population in each stratum.
Waist circumference categories were different for men and women based on Lean's (1995) 'waist action levels' that correspond to BMI categories of normal, overweight and obese [ 20].
The waist circumference categories were determined as follows: normal (< 80 cm), overweight (80 87.9 cm) and obesity (≥ 88 cm).
Among overweight study participants, the prevalence of abnormal glucose tolerance increased from 16%to37%7% among the three waist circumference categories (p < 0.001).
We modeled the associations of % arsenic species biomarkers with body mass index, % body fat, fat free mass, and waist circumference categories in unadjusted regression models and in models including all measures of body composition.
The level of under-reporting, correct reporting and over-reporting for both BMI and waist circumference categories after allowing for margins of error can be viewed in Table 3.
We calculated the estimated means of sedentary time, average physical activity intensity, moderate physical activity and MVPA by age group, BMI and waist circumference categories, years since clinical diagnosis, fibromyalgia severity, marital status, educational level and occupational status, after adjusting for registered time.
Notes for table: § represents participants who under-report their waist circumference category and ¤ represents those who over-report their waist circumference category, after allowing for 2 cm margins of error.
This included data for questions about height, weight and waist circumference category.
Self-report and actual waist circumference category errors were calculated similarly to BMI above.
In total, 58 (21.0%) over- or under-reported BMI or waist circumference category.
