Hard Physical Work Intensifies the Occupational Consequence of Physician-Diagnosed Back Disorder: Prospective Cohort Study with Register Follow-Up among 10,000 Workers

Table 1

Description of the study population at baseline.

	N	Mean (SD)	%
Age, years	9544	43.2 (11.8)
Gender
Men	4479		46.9
Women	5065		53.1
Physical activity at work
Light	6655		71.8
Hard	2611		28.2
Physician-diagnosed back disorder
No	7915		84.9
Yes	1413		15.2
Back pain intensity
0–2	5605		59.9
3-4	1933		20.7
5–9	1816		19.4
Psychosocial work factors (0–100)
Emotional demands	9295	44.2 (24.9)
Influence at work	9238	67.8 (23.9)
Support from colleagues	8657	73.2 (21.4)
Support from leader	8871	69.9 (25.6)
Smoking
No, never	4557		49.0
Ex-smoker	2627		28.3
Yes	2113		22.7
Physical activity during leisure
Low	1230		13.2
Moderate	6259		67.4
High	1800		19.4
BMI (kg⋅m^−2)	9233	25.3 (4.3)
Depression
No	8320		89.1
Yes	1014		10.9
Mental health (0–100)	9326	81.1 (14.5)
Long-term sickness absence during follow-up
Yes	703		7.4
No	8841		92.6