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)

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