Pilot study
The pilot study was a full test, in the field, of the survey methods and instruments. We convenience-selected Kavre district, with three clusters (Dhulikhel Municipality, Panchkhal and Kavre Bhanjyang), and set the sample size at 10% of that of the main study (ie, n = 210). Review during its progress and on completion led to modifications of the questionnaire and allowed assessment of the time required for data collection.