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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

 LevelDevelopment cohortValidation cohort 
  n = 11,221n = 5604p-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(%)Low2924 (26.1)1390 (24.8)0.12
 Medium4349 (38.8)2253 (40.2)
 High3948 (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/mediocre488 (4.4)255 (4.6)0.54
 Reasonable/good10,687 (95.6)5323 (95.4)
Major life events previous year, n(%)05877 (52.4)3239 (57.8)< 0.001
 13577 (31.9)1640 (29.3)
 ≥21767 (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(%)Employee10,066 (89.7)5056 (90.2)0.30
 Self-employed1155 (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]