Table 1 Characteristics of study population according to body mass index (BMI)
<20.5 | ⩽20.5 <22.0 | ⩽22.0 <23.8 | ⩽23.8 <25.9 | ⩽25.9 | |
|---|---|---|---|---|---|
Current BMI | |||||
Number of subjects | 1209 | 1497 | 2335 | 2516 | 2549 |
Age (mean, years) | 57.2±4.5 | 57.0±4.4 | 57.1±4.3 | 57.2±4.3 | 57.5±4.2 |
Occupation (no occupation/housewife, %) | 15.4 | 15.5 | 17.3 | 16.6 | 17.1 |
Educational level (college/university or higher, %) | 12.4 | 12.8 | 12.5 | 11.7 | 10.3 |
Alcohol drinking (drinkers, %) | 19.5 | 19.0 | 18.6 | 19.1 | 18.8 |
Smoking (smokers, %) | 10.3 | 7.6 | 5.9 | 5.7 | 5.8 |
Walking status (<1 h per day, %) | 44.7 | 46.6 | 45.1 | 46.1 | 49.2 |
Family history of breast cancer in mother or sisters (%) | 1.8 | 1.7 | 2.3 | 2.0 | 2.0 |
Age at menarche (mean, years) | 15.4±2.1 | 15.3±1.9 | 15.3±2.0 | 15.2±2.0 | 15.2±2.1 |
Age at menarche (16 years ⩽, %) | 37.2 | 35.9 | 36.2 | 34.7 | 32.4 |
Age at natural menopause (mean, years) | 49.1±3.8 | 49.5±3.6 | 49.4±3.4 | 49.4±3.7 | 49.7±3.7 |
Parity (nulliparous, %) | 3.7 | 2.7 | 1.8 | 2.3 | 2.2 |
Parity number among parous women (mean) | 2.6±1.0 | 2.6±1.0 | 2.7±1.0 | 2.7±1.0 | 2.8±1.1 |
Exogenous female hormone use (users, %) | 11.7 | 10.6 | 9.9 | 10.8 | 10.0 |
Height (mean, cm) | 152.4±6.7 | 151.7±5.2 | 151.5±5.0 | 151.5±4.9 | 150.7±5.3 |
<20.5 | ⩽20.5 <22.0 | ⩽22.0 <23.8 | ⩽23.8 | ||
BMI at age 20 years | |||||
Number of subjects | 2577 | 2460 | 2594 | 2475 | |
Age (mean, years) | 56.9±4.4 | 57.1±4.3 | 57.3±4.3 | 57.6±4.2 | |
Occupation (no occupation/housewife, %) | 19.0 | 17.1 | 16.3 | 14.0 | |
Educational level (college/university or higher, %) | 14.0 | 12.7 | 10.8 | 9.5 | |
Alcohol drinking (drinkers, %) | 20.0 | 17.5 | 18.6 | 19.6 | |
Smoking (smokers, %) | 7.3 | 6.0 | 6.1 | 6.8 | |
Walking status (<1 h per day, %) | 48.7 | 45.6 | 47.0 | 44.7 | |
Family history of breast cancer in mother or sisters (%) | 2.3 | 1.5 | 2.1 | 2.0 | |
Age at menarche (mean, years) | 15.4±2.0 | 15.2±1.9 | 15.3±2.0 | 15.3±2.1 | |
Age at menarche (16 years ⩽, %) | 36.7 | 33.3 | 35.0 | 34.7 | |
Age at natural menopause (mean, years) | 49.3±3.7 | 49.4±3.5 | 49.5±3.7 | 49.6±3.6 | |
Parity (nulliparous, %) | 3.7 | 2.0 | 2.0 | 1.8 | |
Parity number among parous women (mean) | 2.6±1.0 | 2.7±1.0 | 2.7±1.1 | 2.8±1.1 | |
Exogenous female hormone use (users, %) | 11.6 | 9.9 | 10.2 | 10.1 | |
Height (mean, cm) | 152.9±5.8 | 151.6±4.7 | 151.0±5.0 | 150.2±5.4 | |
