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Table 2 Median (IQR) or mean (sd) scores of primary and secondary outcomes in three groups over time

From: Evaluation of a randomized controlled trial on the effect on return to work with coaching combined with light therapy and pulsed electromagnetic field therapy for workers with work-related chronic stress

Outcomes:   Baseline Week 6 Week 12 (after treatment) Week 24 p-value between groups over time*** p-value within groups over time
Primary outcome: Median (IQR)  
 % work-hours RTW (0–100)** Intervention 0.0 (1.25) 22.5 (66.67) 94.7 (80.63) 0.92  
Placebo 0.0 (24.31) 14.3 (64.50) 88.2 (58.54)   
Control 0.0 (0.00) 25.0 (52.50) 62.5 (72.31)   
  Total group 0.0 (4.06)   20.0 (60.56) 87.5 (70.94)   0.00
Secondary outcomes:  
 Emotional exhaustion* Intervention 4.9 (1.28) 3.2 (1.46)   0.20  
Placebo 5.2 (1.26) 2.6 (1.30)    
Control 5.3 (0.89) 3.2 (1.63)    
  Total group 5.1 (1.16)   3.0 (1.47)    0.00
 Work-related fatigue(0–100)*Median (IQR) Intervention 90.9 (27.27) 72.7 (50.0) 40.9 (59.09) 0.70  
Placebo 90.9 (15.91) 72.7 (43.18) 40.9 (52.27)   
Control 90.9 (9.09) 81.8 (50.0) 50.0 (68.18)   
  Total group 90.9 (25.0) 81.8 (43.18) 45.5 (63.6)    0.00
 Vitality (QoL) (0–100)** Intervention 31.7 (18.82) 44.3(18.60) 52.7 (21.32) 0.20  
Placebo 29.2 (17.80) 46.6(17.95) 63.2 (16.40)   
Control 27.8 (13.50) 40.5(16.26) 52.1(18.88)   
  Total group 29.6 (16.76) 43.7 (17.59) 53.0 (19.43)    0.00
 Stress (0–64)* Intervention 22.0 (7.47) 16.3(7.43) 12.0 (7.36) 0.95  
Placebo 21.9 (8.34) 14.1(8.20) 9.4 (7.41)   
Control 23.0 (8.01) 16.6(9.51) 13.1 (9.29)   
  Total group 22.3 (7.88) 15.7 (8.40) 11.5 (8.12)    0.00
 Cortisol (pg/mg) Intervention 32.2 (38.48) 39.1 (44.38) 0.40  
Placebo 38.8 (85.58) 30.1 (26.71)   
Control 20.5 (15.44) 30.0 (19.36)   
  Total group 29.9 (52.60)   32.0 (31.09)    0.00
 Emotional role limitation (QoL) (0–100)** Intervention 21.1 (28.34) 35.6 (37.72) 64.3 (32.62) 0.96  
Placebo 22.6 (27.74) 46.4 (39.90) 67.9 (33.31)   
Control 17.8 (17.78) 30.0 (36.46) 58.3 (39.15)   
  Total group 20.5 (28.00) 37.2 (38.18) 63.5 (34.95)    0.00
 Social Functioning (QoL) (0–100)** Intervention 44.6 (30.39) 55.6 (18.78) 68.8 (22.69) 0.71  
Placebo 44.4 (23.90) 62.1 (24.17) 74.1 (20.67)   
Control 41.7 (22.10) 49.2 (23.20) 66.5 (23.20)   
  Total group 43.5 (25.44) 55.5 (22.53) 69.8 (22.40)    0.00
  1. *higher scores reflect worse outcomes
  2. **higher scores reflect better outcomes
  3. ***For non-parametric tests, only p-value of the between group difference at the last data point is presented
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