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Table 1 Sample size determination of adult HIV patients on first line ART in Amhara regional referral hospitals; Ethiopia from September 2015 to December 2018

From: Incidence and predictors of virological failure among adult HIV patients on first-line antiretroviral therapy in Amhara regional referral hospitals; Ethiopia: a retrospective follow-up study

Assumptions Probability of event Variables Hazard ratio Probability of withdrawal Sample size
Power = 80 0.06 Age 15–24 years 4.4 0.1 265
Significance level(α) = 0.05 0.049 Poor adherence 3.25 0.1 513
Allocation ratio 1:1 0.09 Duration of ART 6.62 0.1 109
Two tailed 0.06 ART regimen change 3.95 0.1 309