Table 2.

Hazard ratios and 95% confidence intervals from crude (unadjusted) and adjusted models with a quadratic effect of time.

	Model
	Crude	Adjusted 1	Adjusted 2	Adjusted 3
Predictor	AIC = 33 657.40	AIC = 33 654.66	AIC = 33 550.92	AIC = 31 042.23
Combination pills v. no contraception (time 1 month)	1.73 (1.44–2.08)	1.73 (1.44–2.08)	1.71 (1.42–2.06)	1.56 (1.30–1.88)
Combination pills v. no contraception (time 3 months)	1.61 (1.38–1.88)	1.61 (1.38–1.89)	1.60 (1.37–1.87)	1.47 (1.26–1.72)
Combination pills v. no contraception (time 6 months)	1.47 (1.28–1.68)	1.47 (1.28–1.68)	1.45 (1.26–1.67)	1.36 (1.18–1.56)
Combination pills v. no contraception (time 12 months)	1.25 (1.06–1.47)	1.25 (1.06–1.47)	1.24 (1.05–1.46)	1.19 (1.01–1.40)
Progestin-only pills v. no contraception (time 1 month)	2.78 (2.14–3.62)	2.77 (2.13–3.61)	2.70 (2.08–3.51)	2.13 (1.64–2.77)
Progestin-only pills v. no contraception (time 3 months)	2.53 (2.03–3.15)	2.52 (2.02–3.14)	2.46 (1.97–3.07)	1.96 (1.57–2.44)
Progestin-only pills v. no contraception (time 6 months)	2.23 (1.84–1.70)	2.22 (1.83–1.70)	2.17 (1.79–2.63)	1.75 (1.44–2.12)
Progestin-only pills v. no contraception (time 12 months)	1.82 (1.44–2.31)	1.82 (1.44–2.30)	1.78 (1.41–2.25)	1.48 (1.17–1.87)
Parental education, mid v. low		0.74 (0.56–0.97)	0.76 (0.58–1.00)	0.79 (0.60–1.04)
Parental education, high v. low		0.69 (0.53–0.91)	0.73 (0.56–0.96)	0.75 (0.57–0.98)
Parental suicidal attempt			3.51 (2.87–4.29)	2.21 (1.80–2.71)
DAD				20.10 (17.73–22.79)
BPN (lifetime)				31.27 (27.14–36.04)

DAD, depressive and anxiety disorders; BPN, bipolar disorder and non-affective psychosis.

HRs for suicidal behavior at specific time points after the onset of oral contraceptive use are presented. See Fig. 1 for the overall trajectory of risk