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. 2022 Mar 16;66(2):157–167. doi: 10.20945/2359-3997000000441

Table 1. Characteristics of the included studies and participants.

Study Country Sample size Age (years) Male (%) BMI (kg/m2) Status of participants Intervention Control Follow-up duration Study quality
Pan 1997 ( 25 ) China 530 45.0 283 (53.4%) 25.8 IGT Dietary and/or exercise individual advice Information about diabetes and IGT 72.0 months 3
Lindahl 1999 ( 26 ) Sweden 186 55.5 69 (37.1%) 30.6 IGT and obesity Dietary and physical activity intervention Usual advice 12.0 months 4
Lindstrom 2003 ( 27 ) Finland 522 55.0 172 (33.0%) 31.2 IGT and overweight Dietary and exercise individual advice Information about diet and exercise 38.0 months 5
Oldroyd 2006 ( 28 ) UK 69 57.9 39 (56.5%) NA IGT Dietary and physical activity advice No dietary or physical activity advice 24.0 months 3
Kawahara 2008 ( 29 ) Japan 426 51.4 199 (46.7%) 24.6 IGT Diabetes education and support Information about diabetes and IGT 37.0 months 2
Roumen 2008 ( 30 ) Netherlands 106 56.3 58 (54.7%) 29.4 IGT Dietary and physical activity advice Information about diet and exercise 36.0 months 4
Yates 2009 ( 31 ) UK 87 65.0 57 (65.5%) 29.2 IGT Structured education program Advice leaflet 12.0 months 4
Bhopal 2014 ( 32 ) UK 171 52.5 78 (45.5%) 30.5 IGT Dietary and physical activity advice Standardized written and verbal advice 36.0 months 4
O’Dea 2015 ( 33 ) Ireland 50 NA 0 (0.0%) 35.5 IGT Multidisciplinary team of nurses, dieticians, and physical activity specialists Standard healthcare advice 12.0 months 2
Van Name 2016 ( 34 ) USA 122 43.4 0 (0.0%) 35.3 Prediabetes Dietary, behavior, physical activity, and weight loss advice Usual care 12.0 months 3
Nanditha 2016 ( 35 ) India 709 46.0 NA 25.9 IGT Dietary and physical activity advice Standard lifestyle modification advice 24.0 months 4
Gokulakrishnan 2017 ( 36 ) India 150 44.5 91 (60.6%) 28.0 Prediabetes and overweight/obese Dietary and physical activity advice Standard lifestyle advice 12.0 months 2
Salas-Salvado 2019 ( 37 ) Spain 248 65.0 NA 32.5 Prediabetes and overweight/obese Dietary, behavior, physical activity advice Educational sessions on an ad libitum med-diet 12.0 months 4