Table 1 Characteristics of all the study population and stratified by BMI
VARIABLES | ALL | In strata of BMI | ||
|---|---|---|---|---|
|  |  | < 25 | ≥ 25-29 | ≥ 30 |
|  | N = 2218 | N = 1235 | N = 732 | N = 251 |
mean (± SD) | mean (± SD) | mean (± SD) | mean (± SD) | |
Age (yrs) | 58.4 (± 5.3) | 58.4 (± 5.1) | 58.2 (± 5.2) | 58.8 (± 5.2) |
Education (yrs) | 12.8 (± 3.3) | 13.5 (± 3.2) | 12.8 (± 3.2) | 12.1 (± 3.2) |
BMI | 24.6 (± 4.6) | 21.8 (± 1.8) | 26.5 (± 1.4) | 32.7 (± 3.4) |
Number of pregnancies | 2.5 (± 1.2) | 2.4 (± 1.2) | 2.5 (± 1.2) | 2.6 (± 1.3) |
Age at first full-term pregnancy (yrs) | 22.1 (± 7.5) | 22.1 (± 8.5) | 22.1 (± 7.7) | 21.8 (± 7.6) |
Postmenopausal HT* | 51% | 54% | 60% | 50% |
Percent density (%) | 18.2 (± 15.9) | 26.2 (± 17.7) | 18.8 (± 14.2) | 10.7 (± 11.5) |
Absolute density (cm 2 ) | 23.5 (± 20.9) | 26.6 (± 18.8) | 24.8 (± 20.9) | 19.3 (± 22.0) |
Physical activity (mins/week) | 288 (± 235) | 318 (± 250) | 266 (± 217) | 201 (± 172) |