Table 5.

Co-relative analyses in sibling and cousin male–male pairs concordant for a history of criminal behaviour before age 20 and discordant for marriage and criminal recidivism

	Sibling pairs		Cousin pairs
	Model 1	Model 2	Model 1	Model 2
Marriage	0.53 (0.45, 0.62)	0.51 (0.43, 0.60)	0.55 (0.47, 0.65)	0.54 (0.47, 0.65)
Age at onset (linear)		0.29 (0.11, 0.77)		0.23 (0.09, 0.56)
Age at onset (quadratic)		1.03 (1.00, 1.06)		1.04 (1.01, 1.07)
Violent criminal behaviour		1.71 (1.48, 1.98)		1.81 (1.58, 2.06)
Parental education (mid v. low)		–		1.12 (0.97, 1.30)
Parental education (high v. low)		–		1.01 (0.84, 1.21)