1.2.2 Methods for the Corbett Study

The Five Country Study by Corbett (2007a) provides high quality evidence relevant to developing guidelines. The methodology included interviews with 938 health workers from 50 facilities across five African countries (Ethiopia, Kenya, Malawi, Mozambique, and Zimbabwe), 30 of which were selected through random cluster sampling, with the others selected through purposive selection seeking facilities with best practices. Within each country, 6 health facilities were randomly selected using a 2 to 4-stage weighted selection method with population, staff, and establishment size used for weighting. Results from the individual questionnaires were supplemented by results from facility assessment checklist (for which the respondents were facility managers), as well as by the results of a policy questionnaire completed by Ministry of Health and other government officials. The study also included 12 focus groups.

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