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Table 3 The incidence rates of second-line treatment failure in one year interval among adults living with HIV in Amhara Region (February 2008–April 2016)

From: Incidence and predictors of second-line antiretroviral treatment failure among adults living with HIV in Amhara region: a multi-centered retrospective follow-up study

One year interval Person-time failures Incidence rate 95%confidence interval
1–12 10214.95 114 0.011 (0.009 0.013)
12–23 7286.56 68 0.009 (0.007 0.118)
23–34 5071.9 29 0.006 (0.004 0.008)
34–45 3420.44 18 0.005 (0.003 0.008)
45–56 2097 11 0.005 (0.003 0.009)
56–67 1168.18 8 0.007 (0.003 0.137)
67–78 442.43 2 0.005 (0.001 0. 018)
78–89 154.31 0 …… ……
> 89 41.07 4 0.097 (0.036 0.259)
Total 30907.57 254 0.008 (0.007 0 .009)