Table 2.

Worker characteristics at control and intervention sites. [GED=general education development; SD=standard deviation]

Individual characteristics	Total	Control				Intervention				P-value
	N	N	%	Mean	SD	N	%	Mean	SD
Age (years)	603			43.1	10.1			39.5	10.8	<0.0001
Tenure (years)	582			19.8	10.1			16.7	10.4	0.0012
Baseline safety climate	604			43.3	6.4			42.0	7.0	0.040
Gender										0.72
Male	577	170	96.6			407	97.1
Female	18	6	3.4			12	2.9
Race/Ethnicity										0.16
White, non-Hispanic	499	156	88.6			343	80.5
Other	103	20	11.4			83	19.5
Union member										0.32
No	12	2	1.2			10	2.4
Yes	571	170	98.8			401	97.6
Education										0.52
Some high school/high school or GED	220	62	36.1			158	38.9
Vocational school/associate’s degree or more	358	110	64.0			248	61.1
Job title										0.006
General Foreman/Foreman	108	43	24.4			65	15.3
Journeyman	370	108	61.0			262	61.5
Apprentice	109	20	11.3			89	20.9
Other	16	6	3.4			10	2.4
Trade										<0.0001
Finishing	103	22	8.5			81	6.6
Mechanical	382	105	59.3			277	64.9
Operators	10	2	1.1			8	1.9
Laborer	43	15	12.4			28	19.0
Ironworkers	47	30	17.0			17	4.0
Other/unknown	19	3	1.7			6	3.8
Month started on-site										0.009
1	131	39	22.0			92	21.5
2	99	33	18.6			66	15.5
3	118	45	25.4			73	17.1
4	154	43	24.3			111	26.0
5	88	17	9.6			71	16.6
6	14	0	0.0			14	3.3
Total months on-Site										0.05
1	209	75	42.4			134	31.4
2	180	53	29.9			127	29.7
3	121	27	15.3			94	22.0
4	94	22	12.4			72	16.9