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Table 1 Characteristics of Included Trial Reports (N = 27)

From: Mediators of physical activity behaviour change among adult non-clinical populations: a review update

Characteristic Value
Study Design  
Trial, N (%)  
   Randomized Control Trial 16 (59)
   2 group experimental 1 (3)
   Quasi-experimental 4 (14)
   Stratified Control Trial 1 (3)
   Non random assignment 1 (3)
   Pre post test 4 (14)
Arm, N (%)  
   3 Arm trial 7 (25)
   2 Arm trial 16 (59)
   4+ Arm trial 3 (11)
Sample size, median (min, max), N 150 (44, 31,420)
Quality score, median (min, max) 6 (3, 7)
Participant population  
All Female trial, N (%) 7 (25)
Both gender trial, N (%) 20 (74)
Setting, N (%)  
   Practice 4 (14)
   Home 2 (7)
   Work Site 3 (11)
   WIC 1 (3)
   University 3 (11)
   Community 3 (11)
   Not reported 11 (40)
Intervention  
Theory, N (%)  
   SCT 3 (11)
   TTM 9 (33)
   PMT 2 (7)
   SDT 2 (7)
   TPB 3 (11)
Duration, median (min, max), wk 12 (2, 104)
Follow up test post intervention, N (%) 8 (29)
PA target, N (%)  
   30 minutes MVPA most days/week 17 (62)
   30 minutes MVPA 3 days/week 4 (14)
   20 minutes VPA 3 days/week 2 (7)
Outcome measures  
PA, N (%)  
   PAR 7 (25)
   GLTEQ 6 (22)
   CHAMPS 2 (7)
   IPAQ 3 (11)
   SQUASH 1 (3)
   Objective measure 2 (7)
   Other self-report questionnaire 7 (25)
No. of psychological assessment tools, median (min, max) 3 (1, 6)
Reporting outcomes  
Change in PA behaviour, N (%) 27 (100)
Change in mediators, N (%) 27 (100)
Mediator analysis, N (%) 6 (22)
Type of mediation test (N = 6)  
Baron and Kenny, N (%) 3 (50)
Unspecified, N (%) 2 (33)
Mackinnon et al., N (%) 2 (33)
Freedman-Schatzkin, N (%) 1 (16)
Bootstrap, N (%) 1 (16)
  1. *note: some studies employed more than one type of test