Fig. 1

Study population and participation (U urban, R rural). 1 Ineligible as these households had no persons within the age range 18–65 years). 2 Households only with persons <18 or >65 years (n = 19), not knowing local language (n = 62) or who are bachelors staying together (n = 86). 3 Includes both refusals (nil rural, 25 urban) and non-participants (interview not possible even after three appointments, at least two of them being on Sundays or holidays)