Table 1.

Internet

Study	N	Treatment	Length of WM Tx	Results	% Weight Change	Effect Size
Harvey-Berino et al³³	46 (37 women) 41 at end of trial 4% attrition “mostly White”	3-GROUP DESIGN: Control -no treatment In-person therapist-led Internet therapist-led Biweekly meetings in person or chat session with same behavioral content, self- monitoring diet & physical activity. Call or e-mail on alternate weeks.	22-week WM after 15 weeks of behavioral WL	During WM: All groups lost an average of 1.6 kg additional weight during the 22 weeks of WM with no between group differences, p = .83.	25% of total weight loss experienced by the total sample during the trial was lost during 15 weeks of WM	.03
Harvey-Berino et al³²	122 (104 women) 90 at end of trial 26% attrition > 96% White	3-GROUP DESIGN: Frequent in-person (FIP) biweekly meetings Minimal in-person (MIP) monthly meetings for 6 months, then no contact Internet support (IS) biweekly chat sessions Same behavioral content, self-monitoring diet & physical activity. Call or e- mail on alternate weeks, FIP & IS.	1-year WM after 24 weeks behavioral WL	Prior to WL Rx through WM ^a: Frequent in-person -10.4 ± 6.3 kg Minimal in-person −10.4 ± 9.3 kg Internet −5.7 ± 5.9 kg p < .05 for between group differences. IS group sustained less WL than FIP & MIP.	More of the FIP & MIP groups maintained a ≥ 5% WL, p < .02. FIP: 84% MIP: 81.3% IS: 44.4%	.20
Harvey-Berino et al³¹	232 (194 women) 176 at end of trial 24% attrition 100% White	3-GROUP DESIGN Frequent in-person (FIP) biweekly meetings at local interactive T.V. (ITV) studio Minimal in-person (MIP) monthly meetings at ITV studio for 6 months, then no contact Internet support (IS) biweekly chat sessions Same behavioral content, self-monitoring diet & physical activity. Call or e- mail on “off” weeks, FIP & IS.	1-year WM after 6 months behavioral WL via ITV (live group members with a televised therapist)	Prior to WL Rx through WM ^a: Frequent in-person −5.1 ± 6.5 kg Minimal in-person −5.5 ± 8.9 kg Internet −7.6 ± 7.3 kg p = .22 for between group differences.	Percent who maintained a ≥ 5% WL: FIP: 46% MIP: 49% IS: 62% p = .23 for between group differences.	.08
Wing et al³⁴	314 (255 women) 291 at end of trial 7% attrition Ethnicity not reported	3-GROUP DESIGN: Control monthly informational newsletter In-person weekly group meetings for 1^st month, then monthly; submitted weekly weights via telephone system Internet weekly group meetings for 1^st month, then monthly via chat room; submitted weekly weights online	18-month WM- subjects had lost ≥ 10% of body weight in the previous 2 years	During WM ^a: Control +4.9 ± 6.5 kg In-person +2.5 ± 6.7 kg Internet +4.7 ± 8.6 kg p = .05 for difference between in-person and control groups	Percent who regained ≥ 2.3 kg: Control 72.4% In-person 45.7% Internet 54.8% p = .008 and p < .001 for difference between control & Internet and control & in- person, respectively.	.11

Abbreviations: WL, weight loss; WM, weight maintenance; Tx, treatment.

mean ± standard deviation.