From: Age at menarche in Korean adolescents: trends and influencing factors
Variables | Hazard Ratio (95Â % CI) | p-value |
---|---|---|
Bodyweight (kg) | 1.013 (1.008–1.017) | <.0001 |
Height (cm) | 1.003 (0.996–1.010) | .4293 |
Maternal age at menarche (y) | Â | Â |
 Younger (<13.0) | 1.514 (1.256–1.826) | <.0001 |
 Normal (13.0–15.9) | 1.00 |  |
 Older (≥16.0) | 0.707 (0.622–0.804) | <.0001 |
BMI (kg/m2) | Â | Â |
 Underweight | 0.327 (0.193–0.554) | <.0001 |
 Normal | 1.00 |  |
 Overweight | 1.227 (1.076–1.400) | .0023 |
 Obese | 1.258 (1.058–1.495) | .0093 |
Household income | Â | Â |
 Low | 1.00 |  |
 Lower middle | 1.117 (0.978–1.276) | .1030 |
 Upper middle | 1.159 (1.018–1.320) | .0259 |
 High | 1.207 (1.059–1.378) | .0047 |
Paternal education level | Â | Â |
 No schooling | 1.00 |  |
 Elementary school | 1.188 (0.571–2.474) | .6446 |
 Middle school | 0.997 (0.487–2.040) | .9924 |
 High school | 1.266 (0.628–2.552) | .5093 |
 College or university | 1.463 (0.752–2.950) | .2880 |
Maternal education level | Â | Â |
 No schooling | 1.00 |  |
 Elementary school | 0.974 (0.504–1.880) | .9363 |
 Middle school | 0.895 (0.471–1.701) | .7351 |
 High school | 1.096 (0.585–2.053) | .7740 |
 College or university | 1.370 (0.729–2.577) | .3280 |
Place of residence | Â | Â |
 Rural | 1.00 |  |
 Urban | 1.039 (0.954–1.131) | .3804 |