A document from the Kenya Ministry of Public Health and Sanitation on guidelines for asthma management estimates that between 10% and 18% of children 13-14 years of age in Kenya have asthma. This is from the ISAAC phase 1 and 3 study, but was only conducted in two sites, Eldoret and Nairobi.
http://apps.who.int/medicinedocs/documents/s21973en/s21973en.pdf
