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Table 5 Action theory test, conceptual theory test and significance of the mediated effect on pedometer-assessed step counts

From: Social cognitive theory mediators of physical activity in a lifestyle program for cancer survivors and carers: findings from the ENRICH randomized controlled trial

  

Action theory

Conceptual theory

Direct effect

Indirect effect

 

Hypothesized mediators

Time (weeks)

A (SE)

p-value

B (SE)

p-value

C’ (SE)

p-value

AB (SE)

95 % CI

AB/(C’ + AB) [Proportion (%)

Self-efficacya

8

0.22 (0.13)

0.08

−66.86 (498.07)

0.89

1944.66 (588.37)

0.001*

−14.86 (107.57)

−300.97 to 157.42

−0.01 (−1%)

Self-efficacyb

20

0.31 (0.15)

0.05*

170.93 (608.68)

0.78

1652.18 (797.21)

0.042*

52.15 (166.17)

−200.98 to 514.51

0.03 (3%)

Behavioral goalc

8

9.12 (4.14)

0.03*

5.44 (15.93)

0.73

1873.05 (611.42)

0.003*

49.56 (133.97)

−170.91 to 382.83

0.03 (3%)

Behavioral goald

20

13.15 (5.01)

0.01*

30.26 (19.19)

0.12

1396.80 (826.62)

0.10

397.88 (219.14)

81.50 to 1025.48*

0.22 (22%)

Outcome expectationsa

8

0.25 (0.12)

0.04*

−168.47 (528.22)

0.75

1981.44 (591.81)

0.001*

−41.42 (93.61)

−343.99 to 80.66

−0.02 (−2%)

Outcome expectationsb

20

0.24 (0.14)

0.09

659.94 (664.96)

0.32

1545.46 (786.64)

0.05*

157.74 (141.27)

−35.94 to 563.70

0.09 (9%)

Impedimentsa

8

0.14 (0.11)

0.21

341.97 (572.86)

0.55

1870.59 (585.45)

0.002*

47.88 (93.65)

−66.83 to 361.66

0.03 (3%)

Impedimentsb

20

0.16 (0.13)

0.22

−202.10 (726.23)

0.78

1655.60 (788.60)

0.04*

−32.32 (179.99)

−564.95 to 229.51

−0.02 (−2%)

Social supporta

8

0.07 (0.22)

0.75

633.81 (274.49)

0.02*

1912.81 (561.93)

0.001*

45.53 (179.25)

−156.63 to 661.05

0.02 (2%)

Social supportb

20

−0.05 (0.23)

0.82

578.01 (403.26)

0.16

1684.70 (761.42)

0.03*

−29.12 (157.80)

−492.06 to 235.47

−0.02 (−2%)

Multi-mediation (all)e

20

-

-

-

-

1499.81 (905.66)

0.10

118.48 (460.17)

−740.53 to 1292.25

7.32 (7%)

  1. *denotes significant difference (P < 0.05)
  2. aSample size n = 88; bSample size n = 74; cSample size n = 85; dSample size n = 71; eAdjusted for baseline steps and potential mediators at baseline