Data quality control
To assure the quality of data, a three-day training was given for data collectors on how to interview and collect data. A pretest was done on 5% of the questionnaire on Haramaya woreda. Close supervision of the data collectors was made by the authors. Collected data was checked both in the field and at the end of each day after data collection, before data entry for completeness and missing values. Double data entry was performed by two authors (AA and MY).