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Table 2 Repeated-measures ANOVA results for main and interaction effects of treatment condition (TC), level of depressive symptoms (DS), and time of assessment (T) for depressive symptoms, pain self-efficacy and subjective work ability (analyses per protocol)

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

Variable Factors
TC DS TC x DS T TC x T DS x T TC x DS x T
  df 1,2 1, 579 1, 579 1, 579 2.6, 1505.7 2.6, 1505.7 2.6, 1505.7 2.6, 1505.7
Depressive symptoms F 0.72 370.81 0.15 229.92 0.77 58.84 1.37
  p .397 <.001 .697 <.001 .495 <.001 .253
  η2 .001 .390 .000 .284 .001 .092 .002
Pain self-efficacy df 1,2 1, 559 1, 559 1, 559 2.8, 1552.0 2.8, 1552.0 2.8, 1552.0 2.8, 1552.0
F 1.00 88.60 0.00 57.39 3.57 6.62 1.53
p .317 <.001 .987 <.001 .016 <.001 .207
η2 .002 .137 .000 .093 .006 .012 .003
WAI score df 1,2 1, 507 1, 507 1, 507 1.8, 889.6 1.8, 889.6 1.8, 889.6 1.8, 889.6
F 0.01 72.36 0.21 37.50 7.15 0.69 0.88
p .920 <.001 .647 <.001 .001 .483 .404
η2 .000 .125 .000 .069 .014 .001 .002
WAI items (multivariate) df 1,2 2, 568 2, 568 2, 568 4, 2274 4, 2274 4, 2274 4, 2274
F 0.57 56.08 2.26 35.94 4.64 1.44 1.13
p .566 <.001 .105 <.001 .001 .217 .339
η2 .002 .165 .008 .059 .008 .003 .002
WAI item physical df 1,2 1, 569 1, 569 1, 569 1.9, 1096.6 1.9, 1096.6 1.9, 1096.6 1.9, 1096.6
F 0.22 59.05 0.27 44.62 2.54 0.33 1.90
p .641 <.001 .605 <.001 .081 .709 .152
η2 .000 .094 .000 .073 .004 .001 .003
WAI item mental df 1,2 1, 569 1, 569 1, 569 1.9, 1096.3 1.9, 1096.3 1.9, 1096.3 1.9, 1096.3
F 0.32 105.68 2.15 56.54 9.07 1.78 0.24
p .574 <.001 .143 <.001 <.001 .171 .780
η2 .001 .157 .004 .090 .016 .003 .000
  1. df1,2 degrees of freedom, η2 eta-square (effect size), WAI work ability index
  2. Bold effects p < .05