2.3 Site, Sample size, frame, design and selection
The hospital based study used8 in the paper was carried out by the Renal Unit of the Department of medicine UNTH Enugu Southeast Nigeria. The UNTH is a 760 – bed hospital that serve about 1/3 of Nigeria population approximately 128 million (2005 estimate)17. The study was carried out from the data generated from the inception of dialysis programme May 1990 to December 2003. It was observed that patients seen either in rural outpost or admitted with CKD were recruited but only ESRD patient as defined by Kidney Disease Improving Global Outcome (KDIGO) were analyzed. The sample size was 908 aged ≥18 years stratified by age and sex8. One population based study12 was carried out in Ujodo Nike Local Government Development Centre in Enugu North Local Government Area of Enugu State, Emene Nike and Mbulu Ujodo respectively and were randomly selected as the semi urban and rural. About 2182 respondents were screened, 1941 respondents aged 25-64 years stratified by sex and 10 year age group according to the WHO STEPS18 surveillance were analyzable data. Another population based study15 was carried out at Umuahia Local Government Southeast, selected as semi-urban Southeast Nigeria. About 400 respondents were screened, 328 respondents aged ≥18 stratified by age and sex were analyzable data conducted according to the WHO STEPS18. These populations were Igbo speaking of southeast.