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Table 2 Baseline characteristics of study groups (intervention compared to control)

From: Effects of a randomized controlled intervention trial on return to work and health care utilization after long-term sickness absence

[n for whom data available] Intervention group (n = 301) Control group (n = 142) p values
Demographic variables
Women, n (%) [273] 179 (59) 94 (66) 0.17 A
Age, average years (SD) [443] 44.2 (11.2) 44.6 (10.2) 0.74 B
Education level, n (%) [305]    0.35
No education or under education 36 (14) 17 (14)  
Skilled worker 73 (29) 41 (34)  
Basic or middle level 159 (55) 36 (47)  
High level (>4 years) 5 (2) 5 (4)  
Health factors
Self-rated health, good-excellent n (%) [373] 143 (56) 59 (50) 0.33 A
SCL-SOM sum score > =16, n (%) [414] 125 (45) 70 (52) 0.15 C
SCL-SOM sum score, median (25 %, 75 %) [414] 14 (0, 36) 16 (2, 40) 0.02 C
Whitely sum score > =7, n (%) [415] 132 (47) 70 (52) 0.32 C
Whitely sum score, median (25 %, 75 %) [415] 7 (0, 25) 8 (0, 4) 0.24 C
Self-reported reason of sickness absence, n (%) [443]    0.53 A
Musculoskeletal disorder (MSD) 170 (56) 74 (52)  
Common mental disorder (CMD) 56 (19) 38 (27)  
Stress 38 (13) 14 (10)  
Functional somatic syndrome/unknown 7 (2) 3 (2)  
Heart disorder, lung disorder, cancer 8 (3) 4 (3)  
Other 22 (7) 9 (6)  
Employment status, n (%) [311]    0.36 D
Employed at inclusion 175 (81) 84 (88)  
Laid off 36 (17) 10 (10)  
Left job 4 (2) 2 (2)  
Work ability n (%) [375]    0.23 A
Poor (0-1) 86 (33) 49 (42)  
Moderate (2-4) 109 (42) 40 (34)  
Excellent (>4-10) 62 (24) 29 (25)  
Perceived workability in 2 years, yes [268] 180 (73) 88 (74) 0.83 A
Work-related factors, n (%)
Support by supervisor, yes [232] 159 (94) 73 (94) 1.00 D
Support by co-workers, yes [241] 166 (98) 75 (95) 0.27 D
Afraid of losing job, yes [95] 66 (40) 29 (37) 0.65 A
Previous year before inclusion, median (25 %,50 %) [443]
Employment or unemployment, weeks 43 (0, 50) 41 (0, 48) 0.20 C
Duration of sickness absence, weeks 7 (1, 29) 7 (2, 27) 0.15 C
Health care utilization
Visits in general practice 11 (1, 37) 14 (1, 33) 0.007 C
Visits in physiotherapist clinics 0 (0, 45) 0 (0, 17) 0.99 C
Visits in out-patient clinics 3 (0, 19) 3 (0, 20) 0.69 C
Visits in psychiatric out-patient clinics 0 (0, 17) 0 (0, 11) 0.08 C
Admissions in hospitals 0 (0, 3) 0 (0, 2) 0.49 C
Admissions in psychiatric hospitals 0 (0, 0) 0 (0, 0) 0.58 C
  1. A Chi2 test, B t-test, C Wilcoxon rank sum test, D Fischer's exact test