Table 2. Association between sexual behavior and timing of first nocturnal ejaculation.
| Sexual behavior | Early puberty groupa) | Normal puberty groupb) | Unadjusted | Adjusted | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| N | % | 95% CI | N | % | 95% CI | OR (95% CI) | P-value | OR (95% CI)c) | P-value | |
| Have you had sexual intercourse? | ||||||||||
| Yes | 154 | 26.8 | 22.5–31.5 | 918 | 10.0 | 9.3–10.8 | 3.27 (2.56–4.17) | <0 .001 | 2.73 (2.03–3.69) | <0.001 |
| No | 441 | 73.2 | 68.5–77.5 | 8,813 | 90.0 | 89.2–90.7 | ||||
| When have you had first sexual intercourse? | ||||||||||
| Elementary school | 74 | 45.4 | 36.8–54.3 | 88 | 10.0 | 8.1–12.4 | 7.45 (5.00-11.10) | <0.001 | 5.96 (3.47–10.22) | <0.001 |
| Middle/high school | 80 | 54.6 | 45.7–63.2 | 815 | 90.0 | 87.6–91.9 | ||||
| Have you had sexually transmitted disease?d) | ||||||||||
| Yes | 35 | 24.5 | 17.1–33.7 | 42 | 4.7 | 3.3–6.6 | 6.60 (3.94–11.08) | <0.001 | 5.17 (2.52–10.20) | <0.001 |
| No | 119 | 75.5 | 66.3–82.9 | 876 | 95.3 | 93.4–96.7 | ||||
N, unweighted; %, weighted; CI, confidence interval.
a)Early puberty group: Male adolescents who underwent first nocturnal ejaculation when they were in grade 4 or earlier (≤grade 4). b)Normal puberty group: Male adolescents who underwent first nocturnal ejaculation when they were in grade 5 or later (≥grade 5). c)OR, odds ratio (adjusted for sociodemographic variables of paternal educational level, maternal educational level, living with both parents, academic performance, and household income). d)Sexually transmitted disease: gonococal infection, syphilis, chlamydial infection, genital herpes, condyloma, urethritis, pelvic inflammatory disease, human immunodeficiency virus infection.