Study design and sample
A cross-sectional study was conducted among 350 health-care personnel. The sample size was calculated using the Statcalc module of the Epi-Info program, version 6, with expected frequency of satisfactory KAP score 30% +/– 5% at alpha error = 0.05 and power of the test = 80%. This yielded a sample size of 291 people. In order to find the association between job title and satisfactory KAP scores, the sample was adjusted and increased to 350 subjects. According to the proportion of health-care providers inside the study departments, a pro- portional weighted sample was taken as follows 110 physicians, 151 nurses and 89 housekeeping staff members (involved in collection and transport of hospital waste) from different de- partments of Ain Shams University Hospitals including the departments of general medicine, paediatrics, general surgery and obstetrics and gynaecol- ogy. The study included both males and females. This was a convenience sample; all available physicians, nurses and housekeeping staff at the time of the study were selected. Out of 368 who were invited to participate, only 12 (3.3%) refused.
Eastern Mediterranean Health Journal La Revue de Santé de la Méditerranée orientale
Approval from both department and central hospital administration was obtained to conduct the study. An oral consent was obtained from participants after explaining the study objectives and assuring data confidentiality. To preserve confidentiality the question- naire was anonymous and data were kept confidential in a file that could be accessed only by the authors.