Table 3.

Correlation matrix and descriptive statistics for ODBQ items.^*

	Speeding				Rule violation					Inattention			Driving while fatigued
	SP1	SP2	SP3	SP4	RV1	RV2	RV3	RV4	RV5	IN1	IN2	IN3	DF1	DF2	DF3
SP1	1
SP2	0.75	1
SP3	0.74	0.87	1
SP4	0.77	0.69	0.72	1
RV1	0.68	0.62	0.63	0.68	1
RV2	0.68	0.58	0.57	0.63	0.73	1
RV3	0.67	0.57	0.57	0.61	0.67	0.77	1
RV4	0.03	0.06	0.07	0.06	0.04	0.04	0.00	1
IN1	0.20	0.29	0.30	0.18	0.21	0.18	0.19	−0.03	1
IN2	0.33	0.44	0.46	0.33	0.34	0.31	0.29	0.05	0.72	1
IN3	0.40	0.42	0.44	0.37	0.38	0.35	0.36	0.05	0.52	0.68	1
IN4	0.45	0.46	0.46	0.44	0.42	0.45	0.47	−0.01	0.38	0.48	0.48	1
DF1	0.32	0.41	0.43	0.31	0.37	0.38	0.33	0.04	0.38	0.46	0.52	0.30	1
DF2	0.34	0.37	0.38	0.32	0.36	0.38	0.34	−0.01	0.32	0.40	0.45	0.34	0.68	1
DF3	0.31	0.37	0.38	0.30	0.33	0.38	0.31	0.05	0.28	0.35	0.42	0.33	0.65	0.77	1
Mean	3.69	3.46	3.52	3.89	3.90	4.05	3.99	4.82	3.41	3.59	3.86	3.89	4.08	4.48	4.63
SD	1.27	1.24	1.21	1.12	1.16	1.12	1.22	0.54	1.16	1.12	1.06	1.25	1.00	0.87	0.75
%Floor	9.4	9.6	8.0	4.7	5.6	4.7	6.9	0.6	7.8	6.1	3.9	6.6	2.7	1.2	0.4
%Ceiling	33.8	24.1	25.7	36.9	39.7	45.6	47.1	86.7	20.2	24.6	33.8	45.0	42.3	68.2	77.3
%Missing	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0

Correlations are bivariate Pearson correlations. All correlations in bold were at least statistically significant at the < 0.05 observed significance level.

^*Los Angeles N = 500, Houston N = 496. 19 cases removed in Houston dataset due to missingness; both datasets were combined. Final analytic sample n = 977.