The mean (±SD) weight gain was 2.5±6.7 kg in the face-to-face group, 4.7±8.6 kg
in the Internet group, and 4.9±6.5 kg in the control group, with a significant difference
between the face-to-face group and the control group (2.4 kg; 95% confidence
interval [CI], 0.002 to 10.8; P = 0.05). The proportion of participants who regained
2.3 kg or more over the 18-month period was significantly higher in the
control group (72.4%) than in the face-to-face group (45.7%; absolute difference,
27%; 95% CI, 14 to 39; P