Table 1 Eligibility criteria

Population

• People who recently (within one year) have been screened for risk of developing type 2 diabetes and diagnosed with prediabetes detected by measuring HbA1c level or fasting plasma glucose, or with an oral glucose tolerance test [32]

Note: If Studies had a mixed population of both type 2 diabetes and prediabetes, and their findings on participants with prediabetes and type 2 diabetes could be read separately. We would include their study data on prediabetes participants

• People aged > 18 years and over living in a home-based environment

• People diagnosed with type 2 diabetes

• Women with gestational diabetes

Prediabetic State

Prediabetes

Impaired fasting glucose

Hyperglycaemia

Glucose intolerance

Insulin resistance

Phenomenon of interest

With respect to the individual, interpersonal, and societal level:

• Facilitators and barriers of initial lifestyle change

• Facilitators and barriers of lifestyle change maintenance

Health behaviour change

Lifestyle change

Setting

• The informants live in home-based environments and receive or have received support from health care providers within the community health care setting regarding lifestyle change

• The informants may or may not have participated in a structured community-based lifestyle intervention program

• Studies reporting from hospital or institutional settings exclusively

Lifestyle intervention program

Health behaviour intervention program

Study design

• Studies with qualitative analysis based on data from interviewing people at risk of developing type 2 diabetes

• Mixed methods studies where the qualitative results are clearly separated from the quantitative data

• Qualitative studies where no human subjects participated and studies with primarily observational methods

• Studies not published in peer reviewed journals

Qualitative studies

Time frame

• No set time frame

Language

• Studies written in English and Scandinavian

• All other languages