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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