Table 3

Prevalence of back problems across levels of work variables by sex^3-150

Variable		Men (n=4209)				Women (n=4027)
Variable		n	% yes			n	% yes
Decision latitude (control):
Low	2214	13.4		2088	12.7
High	1995	15.7		1939	12.3
Psychological demands (demand):
High	2043	15.8		2057	15.1
Low	2166	13.3		1970	9.8
Work social support:
Low	2262	15.7		2179	13.4
High	1947	13.1		1848	11.5
Job insecurity:
High	857	14.8		848	14.9
Low	3352	14.4		3179	11.9
Work physical exertion:
High	2106	16.0		1629	15.0
Low	2103	13.0		2398	10.9
Work:
Full time	3840	14.8		2884	12.6
Part time	369	11.2		1143	12.3
Shift for main job:
Irregular (with/without weekend)	991	15.7		860	13.5
Regular (with weekend)	1036	15.1		775	13.9
Regular (no weekend)	2182	13.6		2392	11.7
Job type:
Blue collar	2040	15.5		578	11.8
White collar	2019	13.7		3326	12.8
Missing	150	12.3		123	9.3

↵3-150 Listwise deletion for all variables except job category, where missing category was created.