Table 1.

Descriptive Statistics and Correlations Among Study Variables

Variable	N	M	SD	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15
1. Age	345	44.45	9.56	-
2. Race	341	0.77	0.42	−.01	-
3. Gender	345	0.90	0.30	−.03	.06	-
4. Work Hours Per Day	329	8.58	1.02	−.01	.01	.06	-
5. Treatment	470	0.60	0.49	−.08	.02	.11*	.09	-
6. Organization	470	0.42	0.49	−.16**	−.04	−.02	.42***	.08	-
7. Motiv. to Comply (12m)	320	4.33	0.51	−.02	−.03	−.15*	.06	−.09	.09	-
8. Motiv. to Participate (12m)	320	4.10	0.55	.00	−.10	−.15*	.12	−.03	.08	.78***	-
9. Sleep Insufficiency (B)	346	1.80	0.91	−.02	−.04	−.04	.04	−.01	.11*	.15*	.10	-
10. Insomnia Symptoms (B)	340	2.69	0.81	.04	−.08	−.04	.02	−.15**	.06	−.05	−.03	.09	-
11. Sleep Duration (B)	342	7.05	0.97	.05	.06	−.15**	−.21***	−.08	−.07	.04	.03	−.22***	.10	-
12. Cognitive Failure (6m)	377	1.85	0.45	.05	.03	.06	.06	−.10*	.13	−.07	−.07	.06	.19**	.05	-
13. Safety Compliance (12m)	320	4.17	0.64	−.07	−.07	−.13*	.05	−.08	.07	.80***	.64***	.03	−.09	.02	−.21***	-
14. Safety Participation (12m)	318	3.70	0.83	−.02	−.07	−.08	.06	.02	.00	.58***	.69***	.06	−.05	.04	−.20***	.58***	-
15. Minor Injuries (12m)	325	0.31	0.46	−.08	.00	−.00	−.03	−.04	.04	−.00	.00	.02	.07	.08	.15*	−.06	−.05	-

Note: Race (0 = Non-white; 1 = White); Gender (0 = Female; 1 = Male); Organization (0 = Organization 1; 1 = Organization 2); Treatment (0 = Control, 1 = Intervention). Motiv. = Motivation. Minor Injuries (0 = No minor injuries experienced in the past 6 months; 1 = At least one minor injury experienced in the past 6 months). B = baseline; 6m = 6-months, 12m = 12-months.

^*< p < .05.

^**p < .01.

^***p < .001.