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Table 3 Mean changes in weight and secondary outcomes from 12 (post-intervention) to 24 months pooled across groups

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

 Mean at baselineMean at post-intervention (12 months)Mean at follow-up (24 months)Pooled Estimates (Change from 12 months to 24 months)
Mean change (SE)zp95% CIR2 Standard GLBR2 Enriched GLB
Primary outcome
 Weight (lbs.)204.03183.67191.527.85 (3.96)1.98.047*0.09, 15.610.020.02
Diabetes risk factors
 Waist circumference (cm)108.79101.25101.570.32 (1.87)0.17.863−3.34, 3.980.000.00
Physical activity
 Physical activity total duration (min/week)98.79220.89256.3735.48 (45.37)0.78.434−53.44, 124.400.010.00
 Physical activity pedometer steps (per day)7403.268740.258190.29−549.96 (55.22)−0.10.319− 1632.19, 532.260.010.02
 Physical activity step equivalents (per day)9058.3613,369.1711,724.57− 1644.60 (165.78)0.10.921− 3413.70, 3084.770.000.00
Self-Monitoring Index
 Food tracking frequency (days/week)4.430.840.35−0.49 (0.18)−2.68.007*−0.85, − 0.130.020.03
 Activity tracking frequency (days/week)6.301.480.38−1.10 (0.24)−4.53<.001*−1.58, −0.620.060.06
Behavior Change Index
 Average fat intake (grams/day)51.9449.3452.363.02 (2.36)1.28.201−1.61, 7.640.010.01
 Average caloric intake (per day)1465.311434.851427.39−7.46 (54.31)−0.14.891−113.90, 98.970.000.00
Habit Strength Index
 Total score2.854.413.97−0.44 (0.17)−2.60.009*−0.77, − 0.110.030.03
  1. *Significant at p < 0.05