CD4 and osteogenesis imperfecta: The use of ART before a decline in CD4 count to <200 cells/μL was estimated to have averted 857 828 OI cases (95% CI, 828 032–874 853) in 2013 (Table 3): 599 711 (95% CI, 595 974–629 673) in sub-Saharan Africa, 195 312 (95% CI, 194 096–205 071) in Asia, and 38 198 (95% CI, 37 962–40 109) in Latin America.