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Table 4 Changes in outcomes variables during baseline through follow-up.

From: A school-based randomized controlled trial to improve physical activity among Iranian high school girls

Variables Time THP N = 55 Mean (SD) Control N = 52 Mean (SD HP N = 54 Mean (SD) Group × time
Perceived benefit Pretest 2.58 (.67)a 2.73 (.63)a 2.88 (.62)a 3.01*
  Posttest 3.57 (.40)b 3.22 (.46) 3.35 (.73)  
  Follow-up 3.41 (.46)c 3.22 (.46) 3.38 (.46)c  
Perceived barriers Pretest 2.89 (.53)a 2.94 (.55)a 2.72 (.51)a 2.40
  Posttest 1.78 (.41)b 2.21 (.60)b 1.85 (.53)b  
  Follow-up 1.97 (.47)c 2.45 (.52) 2.01 (.48)c  
Perceived self efficacy Pretest 1.46 (.46)a 1.45 (.44)a 1.46 (.44)a 7.17**
  Posttest 2.61 (.66)b 1.83 (.57)b 2.45 (.78)b  
  Follow-up 1.97 (.70)c 1.64 (.54) 2.03 (.65)c  
Interpersonal norms Pretest 4.07 (2.02)a 3.46 (1.88)a 3.93 (2.16)a 4.37*
  Posttest 6.16 (4.40)b 4.39 (1.87) 4.83 (2.26)  
  Follow-up 4.80 (1.56)c 4.80 (1.56) 5.20 (2.22)c  
Exposure to models Pretest 11.45 (4.15)a 10.58 (3.92) 9.91 (4.23) 2.40
  Posttest 14.0 (b4.91) 10.56 (3.74) 11.17 (4.28)  
  Follow-up 12.45 (3.29) 10.25 (4.47) 11.89 (4.58)c  
Social support Pretest 42.73 (7.49)a 43.42 (7.71)a 42.56 (6.93)a 2.52*
  Posttest 48.96 (6.85) 43.73 (6.72) 48.28 (10.33)  
  Follow-up 49.05 (6.78)c 46.31 (7.11) 48.41 (8.07)c  
Preferences Pretest 4.81 (2.90)a 5.20 (3.07)a 4.85 (3.44)a 1.69
  Posttest 1.83 (1.45)b 4.07 (2.50) 2.80 (2.47)  
  Follow-up 2.56 (2.46)c 3.71 (2.66) 3.19 (2.17)c  
Stimulus control Pretest 3.39 (1.01)a 3.07 (.98) 3.46 (.83) 3.18*
  Posttest 4.26 (.56)b 3.16 (1.01) 3.67 (1.36)  
  Follow-up 3.93 (.70)c 3.30 (.87) 3.90 (.74)c  
Counter condition Pretest 2.97 (.96)a 2.64 (.98) 2.99 (.83) 2.46*
  Posttest 3.86 (.86)b 2.78 (.78) 3.36 (1.29)  
  Follow-up 3.36 (.73)c 2.72 (.85) 3.29 (1.01)  
Mean PA Pretest 27.16 (12.02)a 30.63 (12.29)a 28.56 (11.30)a 19.14**
  Posttest 75.80 (27.52)b 37.26 (20.45)b 73.61 (28.73)b  
  Follow-up 60.04 (24.87)c 46.26 (21.89) 56.79 (27.58)c  
Overall time PA Pretest 140.88 (62.98)a 170.33 (77.57)a 157.32 (72.02)a 15.50**
  Posttest 371.19 (129.63)b 195.96 (99.66)b 348.08 (139.02)b  
  Follow-up 309.96 (134.32)c 245.35 (101.30) 285.94 (141.33)c  
  1. * p < .05 ** 0 < .005 a = significantly different changes between baseline and post intervention p < .001 – .03. b = significantly different changes between post intervention and follow-up p < .001 – .03. c = significantly different changes between baseline and follow-up p < .001 – .04.