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Table 2 Primary outcomes in the We Can Prevent Diabetes study among participants attending at least one DPP session, by study arm (n = 847; INDIndividual; GRP Group/Individual; AC Attention Control)

From: The effects of financial incentives on diabetes prevention program attendance and weight loss among low-income patients: the We Can Prevent Diabetes cluster-randomized controlled trial

Primary Outcomes

IND

(N = 33; n = 309)

GRP

(N = 30; n = 259)

AC

(N = 30; n = 279)

IND vs AC

difference

GRP vs AC

difference

Weight Changea,b

 % Weight change at 16 weeks (95% CI)

−2.6

(−3.1, −2.0)

−3.1

(−3.7.-2.4)

−3.4

(−4.0,-2.7)

0.8, P = .06

0.3, P = .46

 % Weight change at 12 months (95% CI)

−3.7

(−5.7,-1.6)

−4.4

(−6.5,-2.2)

−7.1

(−9.2, 4.9)

3.4, P = .47

2.7, P = .13

Attendance

 Mean number of DPP core sessions attended (95% CI)

11.1

(10.3, 11.9)

11.4

(10.5, 12.3)

10.5

(10.0, 11.0)

.58,

P = .0005

.94, P = .0001

 Mean number of ALL DPP sessions attended (95% CI)

13.6

(12.4, 14.8)

14.2

(12.9, 15.5)

12.7

(12.0,13.4)

.89,

P = .0002

1.50, P < .0001

  1. a. Number of individuals with two or more measurements for weight change at 16 weeks and from 17 to 52 weeks: IND = 279 and 142; GRP = 231 and 122; AC = 254 and 71.
  2. b. The intra-class correlation coefficient for weight among the DPP groups was 0.11.