. 2018 Jul 16;13(7):e0200681. doi: 10.1371/journal.pone.0200681

Table 1. Study characteristics.

Study ID	Study design	Country	Ethnicity	Age (years)	% Male	Target group	Intervention size (n)	Study duration (months)	Behaviour change objective	Theory for behaviour change
DH!AAN 2013 [13]	RCT	Netherlands	South Asian Surinamese	18–60	51	IFG, IGT, glycated haemoglobin 42–46 mmol/l, HOMA-IR ≥2.39	536	12	Diet, PA	Theory of planned behaviour
DPM 2008 [26]	BAS	India	Indian	>10	41	All inhabitants	850	7	Diet, PA, Stress coping	Community based health promotion
DPP 2012 [27]	BAS	India	Indian	>18	46	All inhabitants	1681	6	Diet, PA, Stress coping	Community based health promotion
Dutta et al. 2014 [28]	RCT	India	Indian	30–80	41	IFG and/or IGT in 2 OGTTs	170	28	Diet	-
Hegde et al. 2013 [29]	RCT	India	Indian	30–75	48	Pre-diabetes, non-alcoholic, non-smoker	29	3	PA	Community based health promotion
Hurst et al. 2010 [30]	RCT	New Zealand	South Asian	23–68	0	Vitamin D deficiency	106	6	Diet	-
IDPP-1 2006 [16]	RCT	India	Indian	35–55	79	IGT on 2 OGTT	531	30	Diet, PA	Community based health promotion
IDPP-2 2009 [36]	RCT^*	India	Indian	35–55	87	IGT on 2 OGTT	203	36	Diet, PA	-
InnvaDiab-DE-PLAN 2012 [33]	RCT	Norway	Pakistani	25–62	0	Not specified	198	7	Diet, PA	-
Islam et al. 2016 [37]	RCT	Bangladesh	Bangladeshi	30–65	51	Pre-diabetes	28	6	Diet	-
Madsen et al. 2015 [35]	LBW vs NBW	India	Indian	18–22	100	LBW	117	1.5	PA	-
McDermott et al. 2014 [32]	RCT	India	Indian	30–65	39	FBG ≥ 5.6 mmol/l 1^st degree relative T2D	41	2	Diet^**, PA	-
PAMH 2013 [31]	RCT	Norway	Pakistani	25–60	100	Not physically active	150	5	PA	Social cognitive theory
Patel et al. 2017 [38]	RCT	US	Indian	>18	46	High risk T2D	36	6	Diet, PA	Community based health promotion
PODOSA 2014 [17]	RCT	UK	South Asian	35–80	46	WC ≥90 men ≥80 women, IGT or IFG	171	36	Diet, PA	Stages of change model
Ramachandran et al. 2013 [25]	RCT	India	Indian	35–55	100	IGT on 2 OGTT, mobile phone, able to read	537	20	Diet, PA	Stages of change
RICE 2014 [34]	Quasi-experimental	US	Indian	18–75	19	High risk T2D, adapted risk assessment tool ADA	126	6	Diet, PA, Stress coping	Community based health promotion
Thirunavukkarasu et al. 2017 [39]	RCT	India	Indian	40–60	0	Prediabetes, prehypertension	75	3	Diet	-
AAPI Guide [46]	Guideline	U.S.	South Asian	-		Not specified	-	-	Diet, PA	-
Apnee Sehat [45]	Guideline Community organization	UK	South Asian	-		Not specified	-	-	Diet, PA	-
FHC [47]	Guideline Health Centre	Canada	South Asian	-		Not specified	-	-	Diet, PA, Stress coping	-
Misra et al. 2011 [48]	Consensus guideline	India	South Asian	-		Not specified	-	-	Diet	-

* The control group in this study received lifestyle intervention and was therefore included in this systematic review.

**The focus of this study was a physical activity intervention, but dietary advice was provided as well.