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