Table 2.

Change in body weight and hemoglobin A_1c at 6 and 12 months by participant group (intervention, intervention completers, and control group).

Measured values	Intervention groupa						Intervention completers						Control groupa
	6 months, mean (95% CI)	Effect sizeb	P valuec	12 months, mean (95% CI)	Effect sizeb	P valuec	6 months, mean (95% CI)	Effect sizeb	P valuec	12 months, mean (95% CI)	Effect sizeb	P valuec	6 months, mean (95% CI)	P valuec	12 months, mean (95% CI)	P valuec
Weight (kg)	−3.31 (−4.43 to −2.19)	−0.12	<.001	−2.22 (−3.31 to −1.13)	0.01	.02	−4.86 (−6.39 to −3.33)	−0.22	<.001	−3.92 (−5.48 to −2.37)	−0.14	<.001	−0.42 (−1.53 to 0.69)	.45	−0.09 (−1.30 to 1.11)	.88
Weight (%)	−3.69 (−4.89 to −2.48)	−0.63	<.001	−2.54 (−3.74 to −1.33)	−0.40	<.001	−5.59 (−7.22 to −3.95)	−0.99	<.001	−4.66 (−6.42 to −2.90)	−0.72	<.001	−0.15 (−1.42 to 1.11)	.81	0.33 (−1.06 to 1.72)	.63
BMI (kg/m2)	−1.35 (−1.79 to −0.92)	−0.13	<.001	−0.88 (−1.31 to 0.44)	−0.00	<.001	−1.79 (−2.34 to −1.24)	−0.15	<.001	−1.44 (−2.02 to −0.87)	−0.09	<.001	−0.12 (−0.53 to 0.29)	.56	−0.04 (−0.47 to 0.39)	.86
HbA1cd (%)	−0.15 (−0.22 to −0.08)	0.08	<.001	−0.23 (−0.32 to −0.14)	−0.13	<.001	−0.17 (−0.25 to −0.10)	−0.06	<.001	−0.28 (−0.37 to −0.19)	−0.38	<.001	−0.17 (−0.25 to −0.09)	<.001	−0.16 (−0.27 to −0.05)	.01

^aAt 6 months, the intervention group lost 2.64 kg more and had a BMI difference of 0.99 kg/m² compared with the control group (both P<.001) in the intention-to-treat (ITT) maximum likelihood estimates missing data analyses. At 12 months, in the ITT analyses, the intervention group lost 1.8 kg more than the control group (P=.01) and had a BMI difference of 0.58 kg/m² (P=.01). In the ITT analyses, HbA_1c was not different between groups at 6 or 12 months, with a difference of 0.004% (P=.94) and 0.006% (P=.93), respectively.

^b≤0.2=small effect; >0.2 to <0.8=medium effect; ≥0.8=large effect.

^cP values were obtained from t tests using a .05 significance level.

^dHbA_1c: hemoglobin A_1c.