Appendix Table 3.

Parameter estimates for maternal age categories from cohort analyses.

	Maternal age	<20	20–24	25–29	30–34	35–39	40–44	≥45
Ever committing a violent crime	Regression estimate	0.68*	0.40*	0.11*	Ref.	−0.06*	−0.04	−0.21*
	Risk ratio	1.96	1.49	1.12	1	0.95	0.96	0.81
Number of violent crimes	Regression estimate	0.14*	0.07*	0.01	Ref.	−0.04*	−0.05*	−0.18*
	Incidence rate ratio	1.15	1.07	1.01	1	0.97	0.95	0.84

Note: GLM-analyses for maternal age for the two different outcomes adjusted for covariates (treating paternal age as categorical). Offset variable is modeled as 1 + q*(time at risk). The estimates for “Ever committing a violent crime” are changes per unit in offset for the regression on probability for committing at least one crime using the complementary log-log link. The risk ratio is the probability of committing a violent offense in each age category divided by the probability in the reference category (at the reference categories of the covariates). The estimates for “Number of violent crimes” are changes in the regression on the intensity, per unit in offset, of criminal offenses using the log link. The incidence rate ratio is the incidence rate in each category relative to the incidence rate in the reference category.

^*p < 0.05. Ref. = reference category.