Table 1. Lifting load is based on company records. The table is divided into information collected at baseline and during the 3-week period. [N=number of participants (baseline questionnaire) and total observations of daily lifting load (3-week period) included in the analyses; SD=standard deviation; BMI=body mass index].

Participant characteristics		N	%	Mean	SD
Baseline
Age		85		38.2	12.7
Sex		83
	Men	54	65.1
	Women	29	34.9
BMI (kg/m2)		83		25.0	4.4
Smoking		83
	Yes	26	31.3
	No	57	68.7
Physical activity during leisure		83
	Reading, watching TV, or other sedentary activities	24	28.9
	Walking, biking, or other light activities ≥4 hours/week	33	39.8
	Sports, heavy gardening, or similar ≥4 hours/week	17	20.5
	Vigorous exercise and sports several times per week	9	10.8
Work ability (0–10)		83		7.9	1.6
Physically demanding work (0–10)		83		7.9	1.9
Employment (years)		83		9.9	11.3
Low-back pain intensity at baseline (0–10)		83		4.8	2.7
Chronic low-back pain		83
	Yes	36	43.4
	No	47	56.6
Stress within the past 2 weeks at baseline		83
	All the time	7	4.8
	Often	16	21.7
	Sometimes	20	36.1
	Rarely	28	16.9
	Never	12	20.5
3-week period
Manual lifting load per workday (kg)		85		1667.2	1886.7
Total observations of manual lifting load (kg) for weight categories		941
	0–499	439	46.7
	500–1999	143	15.2
	2000–3499	118	12.5
	3500–4999	191	20.3
	≥5000	50	5.3
Working hours per workday		85		7.7	0.9