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Crude rates (per 1000 person-years) of AIDS and all cause mortality by cohort, average rate estimated during the period from 31 days to 2 years after start of ART. The size of the squares represents the weight assigned to each study in the meta-analysis and is proportional to the number of events in that study (whiskers show 95% CI). τ2 is the between-cohort variance in the rate
