Table 1

Description of individual and occupational risk factors

		Men (n=368)				Women (n=357)
		n	%			n	%
Age (y)
<30	89	24.2		103	28.9
30–39	147	39.9		139	38.9
40–49	100	27.2		83	23.2
>49	32	8.7		32	9.0
Height (m)
<1.63	12	3.3		142	47.2
1.63–1.68	54	14.7		150	35.5
1.69–1.74	117	32.0		53	15.0
>1.74	183	50.0		9	2.3
BMI (kg/m²)
<20.58	38	10.4		141	39.9
20.58–22.59	74	20.3		106	30.0
22.60–24.92	124	34.1		55	15.6
>24.92	128	35.2		51	14.5
Smoking status
Smoker	159	43.5		124	34.8
Non-smoker	151	41.4		204	57.3
Ex smoker	55	15.1		28	7.9
PWB score
0	129	36.6		91	27.2
1	95	27.0		99	29.6
2	65	18.5		68	20.4
⩾3 problems	63	17.9		76	22.8
Educational level
Low	195	57.7		84	24.1
Medium	61	18.0		101	28.9
High	82	24.3		164	47.0
Occupational groups
Office workers	129	35.0		158	44.3
Hospital workers	16	4.4		137	38.4
Warehouse workers	214	58.1		—	—
Airport registration workers	9	2.5		62	17.3
Pulling or pushing heavy loads
Once a week or less	216	58.7		246	68.9
More than once a week	152	41.3		111	31.1
Carrying heavy loads
Once a week or less	164	44.6		201	56.3
More than once a week	204	55.4		156	43.7
Driving
Never or seldom	214	58.2		316	88.5
Often or everyday	154	41.8		41	11.5
Trunk rotations
Never or seldom	177	48.1		121	33.9
Often or everyday	191	51.9		236	66.1
Bending posture
Never or seldom	147	39.9		142	39.8
Often or everyday	221	60.1		215	60.2