To assure the quality of data, the following measures were considered, including properly designing and pre-testing of the questionnaire, proper training of the data collectors and supervisors on the data collection procedures, and proper coding.

The Afan Oromo version questionnaire was pre-tested on 20 daily laborers of “Best Mineral Water” factory daily laborers in Jimma Arjo district. The interview guide was also pre-tested on a sample of key informants available at their workplace. The interview took up to 30 min. Continuous follow-up and supervision were made by supervisors and the principal investigator throughout the data collection period for checking the proper completeness and relevance of data. Data quality was also ensured during data coding, cleaning, entry to a computer, and during analysis.

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