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Table 2 Mean changes in weight and secondary outcomes from 12 (post-intervention) to 24 months by group

From: The effects of if-then plans on weight loss: results of the 24-month follow-up of the McGill CHIP Healthy Weight Program randomized controlled trial

 

Standard GLB (n = 59)

Enriched GLB (n = 51)

χ2

p

Mean (SE)

Z

p

R2

95% CI

Mean (SE)

z

p

R2

95% CI

Primary outcome

 Weight (lbs.)

5.58 (5.26)

1.06

.289

0.01

−4.74, 15.89

10.78 (5.94)

1.81

.070

0.03

−0.87, 22.43

0.43

.514

Diabetes risk factors

 Waist circumference (cm)

−0.24 (2.46)

− 0.10

.923

0.00

−5.06, 4.59

1.00 (2.84)

0.35

.724

0.00

−4.57, 6.57

0.11

.742

Physical activity

 Physical activity total duration (min/week)

42.62 (49.17)

0.87

.386

0.01

− 53.75, 138.99

12.08 (97.05)

0.12

.901

0.00

− 178.15, 202.31

0.07

.788

 Physical activity pedometer steps (per day)

993.27 (93.00)

1.07

.286

0.02

− 829.54, 2816.08

− 1131.73 (59.76)

−1.89

.058

0.06

− 2302.93, 394.70

3.21

.073

 Physical activity step equivalents (per day)

1413.76 (158.14)

0.89

.371

0.01

− 1685.78, 4513.30

− 2210.32 (203.84)

−1.08

.278

0.02

− 6205.51, 1784.87

1.16

.282

Self-Monitoring index

 Food tracking frequency (days/week)

−0.61 (0.30)

−2.02

.044

0.02

−1.21, − 0.02

− 0.43 (0.22)

−1.90

.058

0.02

− 0.86, 0.01

0.25

.620

 Activity tracking frequency (days/week)

−1.26 (0.35)

−3.59

<.001

0.07

−1.95, −0.57

−0.95 (0.34)

−2.85

.004

0.05

−1.61, −0.30

0.40

.528

Behavior change index

 Average fat intake (grams/day)

3.54 (3.13)

1.13

.258

0.01

−2.59, 9.67

2.34 (3.58)

0.65

.513

0.01

−4.67, 9.35

0.06

.801

 Average caloric intake (per day)

18.85 (72.90)

0.26

.796

0.00

− 124.03, 161.73

−39.18 (80.68)

−0.49

.627

0.00

− 197.43, 118.95

0.29

.593

Habit strength index

 Total score

−0.46 (0.25)

−1.86

.063

0.03

−0.94, 0.03

−0.42 (0.23)

−1.81

.070

0.03

−0.88, 0.03

0.01

.910