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Table 3 Observed and expected frequencies of days of sick leave because of pain dichotomized in up to and more than 2 weeks at the beginning (t0) as well as 6 months (t2) and 12 months (t3) after rehabilitation for both treatment conditions (per protocol analyses; IG; n = 295 above; CG; n = 288)

From: Psychological and work-related outcomes after inpatient multidisciplinary rehabilitation of chronic low back pain: a prospective randomized controlled trial

IG t2
≤ 2 weeks >  2 weeks % Total
t0 ≤ 2 weeks Observed (%) 119 (40.3%) 28 (9.5%) 49.8%
Expected 95.7 51.3
>  2 weeks Observed (%) 73 (24.7%) 75 (25.4%) 50.2%
Expected 96.3 51.7
   % Total 65.1% 34.9%  
IG t3
≤ 2 weeks >  2 weeks % Total
t0 ≤ 2 weeks Observed (%) 124 (42.0%) 23 (7.8%) 49.8%
Expected 106.1 40.9
>  2 weeks Observed (%) 89 (30.2%) 59 (20.0%) 50.2%
Expected 106.9 41.1
   % Total 72.2% 27.8%  
CG t2
≤ 2 weeks >  2 weeks % Total
t0 ≤ 2 weeks Observed (%) 116 (40.3%) 39 (13.5%) 53.8%
Expected 92.6 62.4
>  2 weeks Observed (%) 56 (19.4%) 77 (26.7%) 46.2%
Expected 79.4 53.6
   % Total 59.7% 40.3%  
CG t3
≤ 2 weeks >  2 weeks % Total
t0 ≤ 2 weeks Observed (%) 113 (39.2%) 42 (14.6%) 53.8%
Expected 93.1 61.9
>  2 weeks Observed (%) 60 (20.8%) 73 (25.3%) 46.2%
Expected 79.9 53.1
   % Total 60.1% 39.9%