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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.