Selected characteristics of breast cancer cases and control women, Shanghai, China
| Characteristic . | Cases, n = 378 (%) . | Controls, n = 1,070 (%) . | ||
|---|---|---|---|---|
| Age (y) | ||||
| 35-39 | 14 (3.7) | 13 (1.2) | ||
| 40-44 | 99 (26.2) | 470 (43.9) | ||
| 45-50 | 80 (21.2) | 219 (20.5) | ||
| 50-59 | 56 (14.8) | 124 (11.6) | ||
| >60 | 129 (34.1) | 244 (22.8) | ||
| Cases, n = 378 (age-adjusted %)* | Controls, n = 1,070 (%) | |||
| Education (years completed)† | ||||
| Elementary school or less | 112 (20.2) | 211 (19.7) | ||
| Middle school | 236 (72.5) | 827 (77.3) | ||
| College | 30 (7.3) | 31 (2.9) | ||
| 1° Family history of breast cancer‡ | 16 (4.3) | 17 (1.6) | ||
| Body mass index (kg/m2) | ||||
| ≤20 | 62 (16.7) | 204 (19.1) | ||
| 21-25 | 220 (60.8) | 627 (58.6) | ||
| ≥26 | 96 (22.5) | 239 (22.3) | ||
| Spouse smoking: no. cigarettes/d | ||||
| Nonsmoker | 146 (35.6) | 380 (35.5) | ||
| 1-9 cigarettes | 56 (16.6) | 119 (11.1) | ||
| 10-19 cigarettes | 74 (21.1) | 213 (19.9) | ||
| ≥20 cigarettes | 102 (26.8) | 358 (33.5) | ||
| Physical activity | ||||
| Light | 89 (24.7) | 195 (18.2) | ||
| Moderate | 275 (71.8) | 804 (75.1) | ||
| Heavy | 14 (3.5) | 71 (6.6) | ||
| Characteristic . | Cases, n = 378 (%) . | Controls, n = 1,070 (%) . | ||
|---|---|---|---|---|
| Age (y) | ||||
| 35-39 | 14 (3.7) | 13 (1.2) | ||
| 40-44 | 99 (26.2) | 470 (43.9) | ||
| 45-50 | 80 (21.2) | 219 (20.5) | ||
| 50-59 | 56 (14.8) | 124 (11.6) | ||
| >60 | 129 (34.1) | 244 (22.8) | ||
| Cases, n = 378 (age-adjusted %)* | Controls, n = 1,070 (%) | |||
| Education (years completed)† | ||||
| Elementary school or less | 112 (20.2) | 211 (19.7) | ||
| Middle school | 236 (72.5) | 827 (77.3) | ||
| College | 30 (7.3) | 31 (2.9) | ||
| 1° Family history of breast cancer‡ | 16 (4.3) | 17 (1.6) | ||
| Body mass index (kg/m2) | ||||
| ≤20 | 62 (16.7) | 204 (19.1) | ||
| 21-25 | 220 (60.8) | 627 (58.6) | ||
| ≥26 | 96 (22.5) | 239 (22.3) | ||
| Spouse smoking: no. cigarettes/d | ||||
| Nonsmoker | 146 (35.6) | 380 (35.5) | ||
| 1-9 cigarettes | 56 (16.6) | 119 (11.1) | ||
| 10-19 cigarettes | 74 (21.1) | 213 (19.9) | ||
| ≥20 cigarettes | 102 (26.8) | 358 (33.5) | ||
| Physical activity | ||||
| Light | 89 (24.7) | 195 (18.2) | ||
| Moderate | 275 (71.8) | 804 (75.1) | ||
| Heavy | 14 (3.5) | 71 (6.6) | ||