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Table 2 Tabulation of the final included baseline predictors in the development and validation data sets

From: Predicting the duration of sickness absence due to knee osteoarthritis: a prognostic model developed in a population-based cohort in Sweden

Predictor Development data
n SA spells (%)
Validation data
n SA spells (%)
Sex
  Women 4654 (55.0) 1970 (54.5)
  Men 3814 (45.0) 1652 (45.5)
Age groups
  18–30 years 62 ( 0.7) 15 ( 0.4)
  31–40 years 241 ( 2.8) 100 ( 2.8)
  41–50 years 1350 (15.9) 520 (14.3)
  51–57 years 2580 (30.5) 1171 (32.3)
  58–64 years 4235 (50.0) 1824 (50.2)
Geographical region
  North 1228 (14.5) 522 (14.4)
  Middle 1222 (14.4) 527 (14.5)
  Stockholm/Gotland 1483 (17.5) 614 (16.9)
  West 2628 (31.0) 1105 (30.4)
  South 1907 (22.5) 862 (23.7)
Educational level (years)
  Elementary school (≤ 9 years) 1839 (21.7) 814 (22.4)
  High School (10–12 years) 4664 (55.1) 2042 (56.3)
  College/university (> 12 years) 1965 (23.2) 774 (21.3)
Number of inpatient healthcare days in the 12 months before start date of the SA spell1
  0 6507 (76.8) 2804 (77.2)
  1–2 872 (10.3) 393 (10.8)
  >2 1089 (12.9) 433 (11.9)
Number of SA days in the 12 months before start date of the SA spell
  0 5532 (65.3) 2336 (64.4)
  (0–90] 2070 (24.4) 901 (24.8)
  (90–180] 356 ( 4.2) 144 ( 4.0)
  (180–366] 510 ( 6.0) 249 ( 6.9)
Specialized outpatient healthcare in the 12 months before start date of the SA spell1
  0 1569 (18.5) 691 (19.0)
  1–2 3549 (41.9) 1531 (42.2)
  >2 3350 (39.6) 1408 (38.8)
Employment status at baseline (SA start date)
  Employed/student 7905 (93.4) 3393 (93.5)
  Parental leave 13 ( 0.2) < 8 ( 0.1)
  Unemployed 550 ( 6.5) 235 ( 6.5)
Specialized healthcare at start of the SA spell
  No 3265 (38.6) 1439 (39.6)
  Yes 5203 (61.4) 2191 (60.4)
  1. 1 = Excluding healthcare with O80 and Z-codes Z00-Z99 except Z73.0
  2. SA = sickness absence