Table 1

Descriptive information of the Danish PHysical ACTivity cohort with Objective measurements (DPHACTO) study population at baseline

Valid data (n)n (%)MeanSD
Women625280 (45)
Sector625
 Cleaning120 (19)
 Manufacturing448 (72)
 Transportation57 (9)
Age (years)62544.89.8
Body mass index (kg/m2)61027.54.9
Lifting and carrying at work (scale 1–6)6223.51.4
Seniority in the job (years)59913.210.2
Social support at work (scale 0–8)4296.31.3
Influence at work (scale 0–8)4295.02.1
Objective exposure levels
 Accelerometer wear time (number of working days)6252.61.0
 Physical activity* at work (% work time)62516.97.0
 Physical activity* at leisure (% leisure time)6259.74.2
 Arm elevation >60° at work (hour/day)6110.50.4
 Sitting time at work (hours/day)6252.41.7
 Sitting time at leisure (hours/day)6254.61.4
 Per cent sitting time at work (%)62530.820.4
 Per cent sitting time at leisure (%)62552.612.5
Pain intensity at baseline (scale 0–10)6253.12.7
Pain-free at baseline625180 (29)
Number of days with pain in the past year† (days)622
 0–7338 (54)
 8–90180 (29)
 >90104 (17)
Pain medication in the past 3 months‡ (days)622
 0279 (45)
 1–7206 (33)
 8–3092 (15)
 >3045 (7)
  • *Physical activity was calculated based on accelerometry by summing time in walking, climbing stairs, running and cycling during work and leisure, respectively.

  • †The following categories were merged prior to presentation: ‘0 days’ and ‘1–7 days’; ‘8–30 days’ and ‘31–90 days’; ‘>90 days’ and ‘every day’.

  • ‡The following categories were merged prior to presentation: ‘1–2 days’ and ‘3–7 days’; ‘8–14 days’ and ‘15–30 days’; ‘31–60 days’ and ‘61–90 days’.