Five-year risk ratios and risk differences comparing mortality between patients continuously retained in care at CNICS sites and patients lost to clinic among 7183 patients who initiated antiretroviral therapy between January 1, 1998 and December 31, 2009 and survived for at least one year at 8 US

CI, Confidence interval; RR, risk ratio; RD, risk difference.
aCumulative mortality risk was calculated as the complement of the Kaplan-Meier survival curve at 5 and 10 years.
bConfidence intervals based on 200 nonparametric bootstrap resamples.
cFor sex, age, race, ethnicity, AIDS status at baseline, antiretroviral-therapy-naive at baseline, sexual orientation, injection drug use at baseline, CD4 cell count, viral load at baseline, and calendar date of ART initiation, and time-varying CD4 cell count, viral load, and AIDS status.