Table 3.

Odds ratios showing associations between age at menarche and self-harm at age 16 and age 21

	Age 16				Age 21
	Unadjusted OR (95% CI)	p	Adjusted OR (95% CI)	p	Unadjusted OR (95% CI)	p	Adjusted OR (95% CI)	p
Per 1-year later age at menarche	0.85 (0.78–0.92)	<0.001	0.87 (0.80–0.95)	0.001	0.89 (0.82–0.96)	0.004	0.92 (0.85–1.00)	0.062
Timing of menarche
Early (<11.5 years)	1.39 (1.11–1.74)	0.004	1.31 (1.04–1.64)	0.022	1.32 (1.05–1.65)	0.018	1.22 (0.96–1.54)	0.104
Normative (11.5–13.8 years)	1.00	–	1.00	–	1.00	–	1.00	–
Late (>13.8 years)	0.72 (0.57–0.91)	0.006	0.74 (0.58–0.93)	0.012	0.84 (0.68–1.04)	0.103	0.88 (0.71–1.09)	0.240

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).