Table 3 Relationship of early breast development with maternal, gestational and economic factors
Family factors | Subjects without PT/GM n (%) | Subjects with PT/GM (%) | OR (95% CI) |
|---|---|---|---|
Gestation | |||
Premature birth | 412 (97.6) | 10 (2.4) | 1.0 |
Term birth | 5493 (97.3) | 153 (2.7) | 1.2 (0.6–2.2) |
Post term birth | 198 (96.6) | 7 (2.7) | 1.5 (0.6–3.9) |
Birth weight (kg) | 3.38 ± 0.71 | 3.35 ± 0.57 | 1.0 (0.7–1.3) |
Maternal menarche age (years) | |||
10 | 29 (47.5) | 32 (52.5) | 58.2 (33.6–100.7) |
< 12 | 372 (88.4) | 49 (11.6) | 6.3 (4.4–8.8) |
12–13 | 1462 (97.3) | 40 (2.7) | 1.4 (1.0–2.1) |
> 13 | 4269 (98.1) | 81 (1.9) | 1.0 |
Family monthly income (yuan) | |||
3000–15,000 | 4555 (98.0) | 94 (2.0) | 1.0 |
< 3000 | 87 (95.6) | 4 (4.4) | 2.2 (0.8–6.2) |
> 15,000 | 1461 (95.3) | 72 (4.7) | 2.4 (1.8–3.3) |