Figure 1.

India Health Study (IHS): Design, visit flow, and participation rates. *Participant's household selection was stratified by religion, as well as urban-rural status in Trivandrum only. Both Delhi and Mumbai centers are considered to be entirely urban. Religious groups are not evenly distributed throughout the country; therefore, higher concentrations of Muslim and Christian households were recruited from Trivandrum. §All questionnaires were administered by trained field staff via interview. In Mumbai, no biological samples were collected and all information was collected in the first visit. ¥Denominator for completion rates

Daniel et al. Nutrition Journal 2011 10:12   doi:10.1186/1475-2891-10-12
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