Table 1 Selected characteristics of the study population

From: Body mass index at various ages and mortality in Chinese women: impact of potential methodological biases

Variable  
Age (years) Mean (s.d.) 52.0 (9.1)
Body mass index at baseline, kg m−2 24.0 (3.4)
Body mass index at age 50, kg m−2 23.5 (3.3)
Body mass index at age 20, kg m−2 19.6 (2.5)
Average adult body mass index, kg m−2 22.6 (2.5)
Education level (Percentage)
Elementary school 21.6
 Middle school 36.9
 High school 27.9
College 13.6
Occupation (Percentage)
 Professionals, technicians, administrators 28.7
 Clerical and service workers 20.8
 Manufacturing and agricultural workers 50.6
Annual family income (yuan) (Percentage)
 <10 000 16.2
 10 000 to <20 000 38.3
 20 000 to <30 000 28.1
30 000 17.5
Postmenopausal, (percentage) 49.6
Hormone therapy, (percentage) 2.1
Ever smoked cigarettes, (percentage) 2.8
Ever drank alcohol, (percentage) 2.2
Regular exercise, mean, h/week 2.0 (3.7)