The interviewers successfully reached every district and completed the main survey in one month (May 2013). The average time required per interview was approximately 45 minutes, and one hour per household to complete the data collection. There were no major communication problems. All 15 FCHVs were enthusiastically helpful in this regard.From 2,374 enumerated houses, 164 (non-residential, animal sheds and commercial establishments) were excluded (Figure  2). Among the remaining 2,210 households, 2,109 held eligible respondents, with one participant selected from each. There were nine (6 male, 3 female; age 20–40 years) who were classed as non-participants, four withholding consent altogether and five declining to complete the interview (these incomplete questionnaires were excluded from further analyses). Thus the participation rate was 99.6%.