Table 2.

Multilevel Poisson regression models on past-year reckless driving (n = 1,100)

	Model 1: Main Effects			Model 2: Moderator			Model 3: Final Trimmed Model
	RR	[95% CI]	p	RR	[95% CI]	p	RR	[95% CI]	p
WITHIN-FAMILY
Proband	0.89	[0.77–1.02]	.100	0.90	[0.78–1.03]	.123	0.88	[0.77–1.02]	.088
Age	1.00	[0.97–1.03]	.884	1.00	[0.97–1.03]	.886	—	—	—
Male	1.29	[1.08–1.53]	.004	1.29	[1.08–1.53]	.004	1.30	[1.10–1.54]	.002
Non-Hispanic White	1.07	[0.92–1.26]	.382	1.07	[0.91–1.25]	.439	—	—	—
(Lack of) Premeditation	1.23	[1.05–1.44]	.011	1.17	[0.98–1.39]	.078	1.23	[1.05–1.44]	.010
(Lack of) Perseverance	1.12	[0.94–1.33]	.203	1.17	[0.98–1.39]	.092	1.13	[0.95–1.34]	.172
Sensation seeking	1.40	[1.22–1.60]	.000	1.40	[1.22–1.60]	.000	1.42	[1.25–1.62]	.000
Negative urgency	1.20	[1.03–1.39]	.017	1.21	[1.04–1.41]	.014	1.23	[1.10–1.38]	.000
Positive urgency	1.06	[0.90–1.24]	.504	1.04	[0.88–1.23]	.620	—	—	—
Premed*Perseverance	—	—	—	0.78	[0.60–1.01]	.059	—	—	—
Premed*Sensation seeking	—	—	—	0.95	[0.76–1.20]	.679	—	—	—
Premed*Negative urgency	—	—	—	1.02	[0.79–1.33]	.875	—	—	—
Premed*Positive urgency	—	—	—	1.23	[0.92–1.63]	.159	—	—	—
BETWEEN-FAMILY
Random Intercept Mean	0.58	[0.28–1.18]	.132	0.59	[0.29–1.19]	.141	0.63	[0.54–0.73]	.000
Random Intercept Variance	1.19	[1.09–1.31]	.000	1.19	[1.08–1.31]	.000	1.19	[1.09–1.31]	.000

Note. Coefficients in bold are significant at p<.05. RR = rate ratio; Premed = Premeditation; [95% CI] = 95% confidence interval.