# Table 3 Effects of the PSIW and PSOC interventions on work ability and clinical and work-related parameters at baseline and follow-up

Variable

Group

Baseline

mean (SD)

Follow-up

mean (SD)

Group effect,

F-value, p, η2

Time effect

F-value, p, η2

Group*Time effect,

F-value, p, η2

WAI

PSIW

29.5 (8.02)

30.8 (8.32)

(1:317) = 1.832, 0.177, 0.006

(1:317) = 10.149, 0.002, 0.031

(1:317) = 1.602, 0.206, 0.005

PSOC

25.3 (9.07)

26.8 (9.21)

all

27.2 (8.85)

28.6 (9.02)

aΔ PSIW vs. PSOC

p = 0.000

SF-12 MCS

PSIW

33.3 (11.13)

37.5 (11.77)

(1:315) = 0.155, 0.694, 0.000

(1:315) = 9.093, 0.003, 0.028

(1:315) = 6.950, 0.009, 0.022

PSOC

29.8 (10.24)

32.7 (11.07)

all

31.4 (10.78)

34.9 (11.62)

aΔ PSIW vs. PSOC

p = 0.002

SF-12 PCS

PSIW

45.8 (11.13)

45.4 (10.96)

(1:315) = 0.321, 0.572, 0.001

(1:315) = 0.858, 0.355, 0.003

(1:315) = 0.679,

0.411, 0.002

PSOC

43.8 (11.31)

44.5 (10.90)

all

44.7 (11.36)

45.0 (10.92)

aΔ PSIW vs. PSOC

p = 0.146

PHQ-9

PSIW

11.2 (5.71)

9.6 (6.05)

(1:334) = 0.600, 0.439, 0.002

(1:334) = 13.946, 0.000, 0.040

(1:334) = 1.821, 0.178, 0.005

PSOC

14.4 (6.24)

12.4 (6.44)

all

12.9 (6.20)

11.1 (6.40)

aΔ PSIW vs. PSOC

p = 0.000

PHQ-15

PSIW

10.5 (5.41)

9.7 (5.44)

(1:319) = 0.527, 0.468, 0.002

(1:319) = 3.444, 0.064, 0.011

(1:319) = 1.891, 0.170, 0.006

PSOC

11.4 (5.44)

10.9 (5.56)

all

11.0 (5.44)

10.3 (5.53)

aΔ PSIW vs. PSOC

p = 0.196

PHQ-7

PSIW

9.5 (5.36)

8.2 (5.31)

(1:341) = 0.500, 0.480, 0.001

(1:341) = 12.259, 0.001, 0.035

(1:341) = 0.858, 0.355, 0.003

PSOC

11.3 (5.53)

9.5 (5.43)

all

10.4 (5.50)

8.9 (5.41)

aΔ PSIW vs. PSOC

p = 0.005

IS

PSIW

30.7 (11.74)

29.7 (12.23)

(1:317) = 1.453, 0.229, 0.005

(1:317) = 2.243, 0.135, 0.007

(1:317) = 1.719, 0.147, 0.007

PSOC

35.2 (12.12)

34.2 (12.33)

all

33.0 (12.13)

32.1 (12.47)

aΔ PSIW vs. PSOC

p = 0.001

MBI-EE

PSIW

3.9 (1.27)

3.8 (1.27)

(1:325) = 0.012, 0.912, 0.000

(1:325) = 4.199, 0.041, 0.013

(1:325) = 0.758, 0.385, 0.002

PSOC

4.5 (1.24)

4.3 (1.18)

all

4.2 (1.28)

4.1 (1.25)

aΔ PSIW vs. PSOC

p = 0.000

MBI-DP

PSIW

3.2 (1.11)

3.2 (1.10)

(1:316) = 0.150, 0.699, 0.000

(1:316) = 0.524, 0.470, 0.002

(1:316) = 0.008, 0.927, 0.000

PSOC

3.5 (1.22)

3.5 (1.18)

all

3.3 (1.17)

3.4 (1.15)

aΔ PSIW vs. PSOC

p = 0.015

MBI-PA

PSIW

4.5 (0.82)

4.5 (0.78)

(1:324) = 0.760, 0.384, 0.002

(1:324) = 0.437, 0.509, 0.001

(1:324) = 0.001, 0.980, 0.000

PSOC

4.4 (0.91)

4.3 (0.92)

all

4.4 (0.86)

4.4 (0.86)

aΔ PSIW vs. PSOC

p = 0.115

1. Legend: a Δ PSIW vs. PSOC (p): Results of a t-test comparing PSIW and PSOC groups at baseline, η2 partial square eta (effect size), p level of significance