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Table 1 Changes in outcomes at four and 12 months post intervention

From: Processes of behavior change and weight loss in a theory-based weight loss intervention program: a test of the process model for lifestyle behavior change

  Control group mean (SD) Intervention group mean (SD) Effect size ( d ) a
  Baseline 4 months 12 months Baseline 4 months 12 months 4 months
Weight (kg) N = 52 97.57 (12.84) N = 48 96.65 (12.55) N = 47 95.67 (12.39) N = 54 96.63 (13.96) N = 45 93.78 (13.76)** N = 43 92.98 (14.10) −0.67
Diet N = 52 N = 48 N = 47 N = 54 N = 45 N = 43  
Fat intake 32.23 (10.91) 27.57 (10.25) 28.04 (9.19) 29.98 (9.13) 24.22 (8.58) 24.98 (8.31) −0.21
Fiber intake 36.98 (10.00) 34.40 (9.62) 34.30 (9.61) 36.72 (11.60) 39.85 (10.64)*** 39.67 (11.29)** 0.70
Physical activity N = 53 N = 44 N = 43 N = 53 N = 42 N = 42  
MVPAb 24.56 (17.75) 28.00 (20.12) 29.19 (23.00) 24.93 (23.51) 31.14 (21.18) 26.25 (21.09) -.11
Activity countsb 270.52 (106.56) 286.20 (123.01) 287.68 (119.26) 240.60 (118.44) 266.32 (130.41) 250.85 (118.59) -.09
Perceived importance N = 48 N = 47 N = 45 N = 52 N = 47 N = 44  
Diet (scale 1–10) 8.49 (1.29) 8.50 (1.43) 8.23 (1.97) 8.77 (1.40) 9.26 (.92) 9.14 (1.17) .29
PA (scale 1–10) 7.74 (1.64) 7.67 (1.95) 7.42 (2.17) 8.19 (1.98) 8.61 (1.57)* 8.30 (1.71) .67
Self-Efficacy N = 48 N = 47 N = 45 N = 52 N = 47 N = 44  
Diet (scale 1–8) 4.42 (1.48) 4.41 (1.77) 4.84 (1.53) 4.43 (1.64) 5.91 (1.30)*** 5.89 (1.41)*** .98
PA (scale 1–8) 2.76 (.93) 2.74 (.84) 2.78 (.99) 2.93 (.89) 3.28 (.83)** 3.14 (.89) .42
Social Support N = 48 N = 47 N = 45 N = 52 N = 47 N = 44  
Diet (scale 1–5) 3.23 (.86) 3.20 (1.03) 3.25 (.87) 3.17 (.80) 3.39 (.91) 3.30 (.97) .39
PA (scale 1–5) 2.29 (1.07) 2.23 (1.15) 2.09 (.99) 2.14 (1.02) 2.57 (1.04)*** 2.29 (.94)* .89
Understanding (scale 1–5) N = 46 N = 47 N = 45 N = 52 N = 47 N = 44  
  3.21 (.65) 3.41 (.54) 3.54 (61) 3.24 (.65) 4.07 (.51)*** 4.11 (.50)*** .81
Action planning N = 46 N = 47 N = 45 N = 47 N = 46 N = 44  
Diet 2.76 (.75) 2.96 (1.20) 3.34 (1.22) 2.79 (.76) 3.54 (.83)** 3.33 (.89) .53
  N = 47 N = 46 N = 45 N = 52 N = 46 N = 44  
PA 2.41 (.74) 2.80 (1.13) 3.11 (1.39) 2.52 (.84) 3.17 (.90) 3.11 (1.10) .33
Coping planning N = 46 N = 47 N = 45 N = 50 N = 46 N = 44  
Diet 2.38 (.69) 2.72 (1.30) 3.13 (1.39) 2.40 (.76) 3.25 (.93)* 3.15 (1.02) .48
  N = 46 N = 46 N = 45 N = 52 N = 46 N = 44  
PA 2.13 (.67) 2.60 (1.22) 2.90 (1.43) 2.18 (.83) 2.99 (.93) 2.94 (1.05) .38
Self-monitoring N = 47 N = 47 N = 45 N = 52 N = 47 N = 44  
Diet 2.60 (.60) 2.59 (.60) 2.61 (.65) 2.52 (.48) 2.96 (.50)** 2.92 (.45)** 1.03
PA 2.32 (.56) 2.37 (.51) 2.38 (.65) 2.36 (.57) 3.01 (.61)* 2.69 (.59)* 1.00
Enjoyment N = 46 N = 47 N = 45 N = 52 N = 46 N = 44  
Diet 4.72 (1.34) 4.76 (1.48) 4.86 (1.25) 4.83 (1.30) 5.54 (1.32)** 5.63 (1.21)** .54
PA 3.67 (1.38) 3.63 (1.23) 3.44 (1.40) 4.00 (1.44) 3.47 (1.54) 3.61 (1.82) -.24
Impulse control N = 47 N = 47 N = 45 N = 52 N = 46 N = 44  
Cognitive restraint 2.35 (.52) 2.32 (.75) 2.31 (.59) 2.24 (.52) 2.68 (.64)** 2.57 (.58)** .75
Uncontrolled eating 1.99 (.70) 1.94 (.67) 1.96 (.67) 1.99 (.68) 1.82 (.61) 1.76 (.57)* -.17
  1. Notes: PA – physical activity; *p < .05, **p < .01, ***p < .001; N varies due to lack of valid wear-time for PA, or non-completion of full set of measures due to participant time restraints/preference; achange in intervention group from baseline, relative to change in control group; bValues from log transformations were used in analyses, but raw data presented here for ease of interpretation. Only participants reporting ≥ 4 days complete accelerometry data at each time point were included. All other missing data reflects drop-out from the trial (N = 12), and refusal to complete all measures due to lack of time/interest.