Table 1. Effects of early menarche on sexual behaviors from the Korean Youth Risk Behavior Web-based survey (2012).
| Variable | Early menarche | Normal menarche | OR* (95% CI) |
|---|---|---|---|
| Intersexual kissing or petting | 1.54 (1.28–1.87) | ||
| Yes | 254/974 (26.1) | 2,323/16,090 (14.4) | |
| No | 720/974 (73.9) | 13,767/16,090 (85.6) | |
| Intersexual intercourse | 2.35 (1.65–3.36) | ||
| Yes | 67/974 (6.9) | 522/16,893 (3.1) | |
| No | 907/974 (93.1) | 16,371/16,893 (96.9) | |
| Homosexual kissing or petting | 3.53 (2.22–5.59) | ||
| Yes | 34/974 (3.5) | 167/16,893 (1.0) | |
| No | 940/974 (96.5) | 16,726/16,893 (99.0) | |
| Homosexual intercourse | 7.70 (4.04–14.66) | ||
| Yes | 25/974 (2.6) | 55/16,893 (0.3) | |
| No | 949/974 (97.4) | 16,838/16,893 (90.7) | |
| Victims of sexual assault | 2.89 (1.98–4.22) | ||
| Yes | 54/974 (5.5) | 302/16,893 (1.8) | |
| No | 920/974 (94.5) | 16,591/16,893 (98.2) | |
| Assailants of sexual assault | 13.55 (6.61–27.78) | ||
| Yes | 23/974 (2.4) | 40/16,893 (0.2) | |
| No | 951/974 (97.6) | 168/16,893 (99.8) | |
| Intercourse without any contraception | 1.2 (1.06–3.46) | ||
| Yes | 46/73 (63.0) | 294/556 (52.9) | |
| No | 27/73 (37.0) | 262/556 (47.1) | |
| History of pregnancy | 5.72 (2.31–14.15) | ||
| Yes | 20/72 (27.8) | 34/554 (6.1) | |
| No | 52/72 (72.2) | 520/554 (93.9) |
Values are presented as number (%).
OR, odds ratio; CI, confidence interval.
*Adjusted for sociodemographic variables of paternal educational level, maternal educational level, living with parents, academic performance, and household income; comparison between the early and normal menarche groups.
Adapted from Cheong et al. Ann Pediatr Endocrinol Metab 2015;20:130-5, according to the open-access policy of The Korean Society of Pediatric Endocrinology17).