CD4 and tuberculosis: At initiation of ART, patients truly lost to follow-up were younger (median age 31 vs. 33 years, p<0.001), had a higher CD4 count (median 116 vs. 99 cells/μL, p = 0.012), a lower WHO stage (34% vs. 37% with stage IV disease, p = 0.077), were more likely to be pregnant (6.2% vs. 2.0%, p<0.001), and initiated in later calendar years (p = 0.001) than patients not lost to follow-up; 37% of all patients were on treatment for tuberculosis and 8% had been exposed to prevention of mother-to-child transmission.