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Table 4 Effects of intervention on hypothesised mediators, at 4 weeks or 4 months, with adjustment for baseline values (coefficients and standard errors from random-effects regressions)

From: Effectiveness and cost-effectiveness of a loyalty scheme for physical activity behaviour change maintenance: results from a cluster randomised controlled trial

MEDIATOR (range) Four week mediators Six month mediators
n b (SE) p-value n b (SE) p-value
PA self-efficacy(1–5) 597 0·09 (0·08) 0·31    
Intentions (1–7) 595 0·29 (0·13) 0·02    
Outcome expectations (1–5) 528 −0·03 (0·06) 0·58    
Financial motivation (1–7) 600 0·11 (0·15) 0·46    
Planning (1–4) 575 0·02 (0·05) 0·75 436 0·08 (0·06) 0·18
Social norms (1–7) 576 0·23 (0·08) < 0·01 434 0·10 (0·12) 0·42
Identified regulation (1–5) 598 0·14 (0·06) 0·01 459 0·11 (0·05) 0·02
Integrated regulation (1–5) 595 0·23 (0·07) < 0·01 454 0·26 (0·08) < 0·01
Intrinsic motivation (1–5) 599 0·18 (0·06) < 0·01 456 0·17 (0·06) < 0·01
Habit (1–5)     448 0·48 (0·12) < 0·01
Workplace norms (1–5)     456 0·13 (0·07) 0·06
Recovery self-efficacy (1–4)     457 0·02 (0·06) 0·80
Maintenance self-efficacy (1–4)     459 −0·02 (0·09) 0·80
Outcome satisfaction (1–5)     427 0·03 (0·05) 0·56
  1. PA Physical activity, SE Standard error
  2. NB. All questionnaire items were scaled so that lower values indicated lower levels of the mediator/outcome. Results are adjusted for strata, season, baseline pedometer steps/day and baseline mediator values with cluster-adjusted standard errors and p-values (b = coefficient for group assignment variable, i.e. Intervention versus Control)