Table 3.

Incidence of diabetes defined by HbA1c ≥6.5 % and by self-report at 1- and 2-years stratified by NDPP enrollment and retention, and adjusted odds of progression to diabetes.^a

	Total N	No diabetes	Diabetes	p-Value	Adjusted odds ratio (95 % CI) compared to the reference groupa	p-Value
1-year outcome
Diabetes by HbA1c criterion
Not enrolled	3548	3112	436 (12 %)	0.003	(reference)
Enrolled	546	503	43 (8 %)		0.60 (0.41–0.86)	0.005
Disenrolled before week 16	73	62	11 (15 %)	0.007	1.37 (0.69–2.74)	0.371
Disenrolled after week 16 but before week 44	220	198	22 (10 %)		0.73 (0.44–1.22)	0.229
Completed through week 44	251	241	10 (4 %)		0.29 (0.14–0.59)	0.006
Self-report of diabetes
Not enrolled	699	648	51 (7 %)	0.004	(reference)
Enrolled	439	425	14 (3 %)		0.43 (0.22–0.83)	0.013
Disenrolled before week 16	33	28	5 (15 %)	<0.001	2.40 (0.85–6.77)	0.100
Disenrolled after week 16 but before week 44	168	162	6 (4 %)		0.39 (0.13–1.10)	0.075
Completed through week 44	235	232	3 (1 %)		0.20 (0.06–0.64)	0.007
2-year outcome
Diabetes by HbA1c criterion
Not enrolled	4717	4033	684 (15 %)	0.022	(reference)
Enrolled	653	580	73 (11 %)		0.80 (0.60–1.05)	0.108
Disenrolled before week 16	92	73	19 (21 %)	0.002	1.65 (0.95–2.87)	0.075
Disenrolled after week 16 but before week 44	268	238	30 (11 %)		0.75 (0.49–1.15)	0.189
Completed through week 44	290	267	23 (8 %)		0.58 (0.36–0.91)	0.018
Self-report of diabetes
Not enrolled	664	591	73 (11 %)	0.009	(reference)
Enrolled	402	377	25 (6 %)		0.54 (0.32–0.91)	0.021
Disenrolled before week 16	28	22	6 (21 %)	<0.001	1.80 (0.64–5.06)	0.266
Disenrolled after week 16 but before week 44	159	147	12 (8 %)		0.60 (0.29–1.25)	0.173
Completed through week 44	214	207	7 (3 %)		0.33 (0.15–0.75)	0.008

^aAdjusted for age group, sex, and race.