highly significantP < 0.001
When stratified by CD4 count subgroups, CMV retinitis was observed in 29.6% of patients with CD4 <50 cells/mm 3 (8/27), 20.0% of those with CD4 between 50 and 200 cells/mm 3 (5/25), and only 1.4% of those with CD4 >200 cells/mm 3 (1/72), demonstrating a highly significant association ( P < 0.001).