Table 4.
Relative risk ratios showing associations between age at menarche and suicidal and non-suicidal self-harm, v. no self-harm, and suicidal v. non-suicidal self-harm, at age 16
| Non-suicidal self-harm v. no self-harm | Suicidal self-harm v. no self-harm | Suicidal v. non-suicidal self-harm | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Unadjusted | Adjusted | Unadjusted | Adjusted | Unadjusted | Adjusted | |||||||
| RRR (95% CI) | p | RRR (95% CI) | p | RRR (95% CI) | p | RRR (95% CI) | p | RRR (95% CI) | p | RRR (95% CI) | p | |
| Per 1-year increase in aPHV | 0.85 (0.77–0.92) | <0.001 | 0.86 (0.78–0.94) | 0.013 | 0.86 (0.76–0.97) | 0.002 | 0.90 (0.79–1.02) | 0.087 | 1.02 (0.89–1.16) | 0.823 | 1.04 (0.91–1.20) | 0.540 |
| Timing of aPHV | ||||||||||||
| Early (<11.0 years) | 1.31 (1.02–1.71) | 0.037 | 1.26 (0.97–1.64) | 0.089 | 1.55 (1.09–2.20) | 0.014 | 1.42 (0.99–2.02) | 0.056 | 1.18 (0.79–1.76) | 0.419 | 1.13 (0.75–1.69) | 0.570 |
| Normative (11.0–12.6 years) | 1.00 | – | 1.00 | – | 1.00 | – | 1.00 | – | 1.00 | – | 1.00 | – |
| Late (>12.6 years) | 0.69 (0.52–0.90) | 0.007 | 0.69 (0.52–0.92) | 0.011 | 0.79 (0.53–1.18) | 0.248 | 0.84 (0.56–1.25) | .379 | 1.15 (0.73–1.83) | 0.541 | 1.20 (0.75–1.93) | 0.441 |
Analyses completed on imputed datasets (n = 4042).
Adjusted models include measures of maternal education, material hardship, maternal depression, childhood sexual abuse, parental separation, and body mass index (BMI).