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Table 2 Comparison of the variation of the SF-36 and WLQ scores (between baseline and week 26) in the experimental groups.

From: Impact on the Quality of Life of an Educational Program for the Prevention of Work-Related Musculoskeletal Disorders: a randomized controlled trial

  Intervention Group Control Group Mean difference 95% CI P Value*
  n Mean (SD) n Mean (SD)    
SF-36 scores
Physical functioning 37 -1.49 (21.5) 38 0.92 (19.4) -2.41 -11.8, 7.0 0.613
Role physical 38 6.58 (24.4) 38 5.49 (34.6) 1.09 -12.6, 14.8 0.874
Bodily pain 39 10.9 (21.1)† 38 9.63 (22.4)† 1.27 -8.6, 11.2 0.800
General health 36 4.94 (10.4)† 36 2.64 (13.9) 2;31 -3.5, 8.1 0.428
Vitality 36 7.78 (16.2)† 37 6.76 (20.2) 1.02 -7.5, 9.6 0.813
Social functioning 35 6.43 (21.9) 36 11.11 (23.9)† -4.68 -15.5, 6.2 0.393
Role emotional 38 7.89 (39.8) 38 14.04 (35.2) -6.14 -23.3, 11.0 0.479
Mental health 39 8.37 (16.0)† 37 4.32 (16.5) 4.05 -3.4, 11.5 0.281
Physical component summary 34 5.04 (10.1)† 36 4.64 (16.2) 0.41 -6.1, 6.9 0.900
Mental component summary 31 8.55 (17.2)† 34 9.52 (19.4)† -0.97 -10.1, 8.1 0.832
WLQ scores
Time management 36 0.56 (13.5) 35 -0.11 (14.3) 0.66 -5.9, 7.2 0.841
Physical demands 37 4.62 (32.5) 38 3.35 (38.3) 1.27 -15.1, 17.6 0.877
Mental-interpersonal demands 37 -2.10 (6.3) 37 -1.70 (11.6) -0.41 -4.8, 3.9 0.853
Output demands 38 -0.92 (9.4) 37 -5.95 (12.8)† 5.02 -0.2,10.2 0.057
WLQ index (percent) 34 -0.18 (2.4) 34 -0.72 (3.2) 0.54 -0.8,1.8 0.435
  1. * Student's t test. † P ≤ 0.01 by paired Student's t comparing baseline and week 26 scores within the group.
  2. Abbreviations: SF-36 = Medical Outcomes Study 36 - Item short-form health survey; WLQ = Work Limitation Questionnaire.