CD4 and pneumocystosis: In a multivariate Cox regression model controlling for PCP diagnosis and prophylaxis as well as the covariates listed previously, the hazard ratio for women compared to men was 2.22 (95% CI: 1.14 to 4.33, n = 225), whereas this was 2.44 (95% CI: 0.96 to 6.22, n = 139) in the model containing minimum CD4 cell count.