Table 1.

Summary of studies included in this review.

Lead author (year)	Approach (DMa specific)	Depression criteria	DM type (Age target)	Participants, n	Control	Intervention length	Postassessment
Bond (2010) [30]	CBTb (yes)	N/Ac	Not reported by authors (older adults)	62	Wait list	6 mo (nonmodular)	6 mo after baseline
van Bastelaar (2011) [21]	CBT (yes)	CES-Dd>16	I and II (adults)	255	Wait list	8 modules (1 per wk)	1 mo follow-up
Cohn (2014) [31]	Positive psychology (no)	N/A	II (adults)	53	Wait list with emotion reporting	5 modules (1 per wk)	1 wk after the final module
Nobis (2015) [32]	CBT (yes)	CES-D≥23	I and II (adults)	260	Access to unguided Web-based psychoeducation	6-8 modules (1 per wk) + booster session	8 wk after randomization
Newby (2017) [33]	CBT (no)	Patient Health Questionnaire-9>5	I and II (adults)	90	Treatment as usual	6 modules (10 wk, 5 d minimum between)	1 wk after module 6 (or wk 10) 3 mo follow-up for intervention group only

^aDM: diabetes mellitus.

^bCBT: cognitive behavioral therapy.

^cNot applicable.

^dCES-D: Center for Epidemiological Studies-Depression.