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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.