Skip to main content

Table 1 Baseline characteristics of participants in the development and validation cohort

From: Long-term sickness absence in a working population: development and validation of a risk prediction model in a large Dutch prospective cohort

  Level Development cohort Validation cohort  
   n = 11,221 n = 5604 p-value
Female, (%)   4819 (42.9) 2753 (49.1) < 0.001
Age, mean (SD)   53.9 (5.4) 50.2 (5.2) < 0.001
Educational levela, n(%) Low 2924 (26.1) 1390 (24.8) 0.12
  Medium 4349 (38.8) 2253 (40.2)
  High 3948 (35.2) 1961 (35.0)
SF-12 physical healthb, mean (SD)   52.4 (7.0) 52.2 (7.4) 0.07
Physically fitc, n(%)   4502 (40.4) 2535 (45.4) < 0.001
Physical job loadd, mean (SD)   1.8 (0.9) 1.9 (0.9) < 0.001
Knowledge and skills match the job, n(%) Bad/mediocre 488 (4.4) 255 (4.6) 0.54
  Reasonable/good 10,687 (95.6) 5323 (95.4)
Major life events previous year, n(%) 0 5877 (52.4) 3239 (57.8) < 0.001
  1 3577 (31.9) 1640 (29.3)
  ≥2 1767 (15.7) 725 (12.9)
Work abilitye, mean (SD)   8.0 (1.4) 8.1 (1.4) 0.10
Sickness absence days previous year, mean (SD)   2.9 (5.1) 2.7 (4.9) 0.01
Employment status, n(%) Employee 10,066 (89.7) 5056 (90.2) 0.30
  Self-employed 1155 (10.3) 548 (9.8)
  1. SD = standard deviation, SF = Short Form Health Survey
  2. aLow: lower general secondary educational, preparatory secondary vocational education. Medium: intermediate vocational training, higher general secondary education, pre-university education. High: higher vocational education, university education
  3. bWeighted summary score (range 0–100) assessing physical health using 6 items of the 12-Item Short-Form Health Survey. Higher scores indicating better perceived health
  4. cIntensive physical exercise at least ≥3 days per week for ≥20 min
  5. dAverage of five items (range: 1 = never, 5 = always) from the Dutch Musculoskeletal Questionnaire [22]
  6. eMeasured with the first item of the Work Ability Index (WAI) [23]