Fig. 1From: Magnitude and associated factors of virological failure among children on ART in Bahir Dar Town public health facilities, Northwest Ethiopia: a facility based cross-sectional studySchematic presentation of sampling procedure to assess the magnitude and associated factors of virological failure among children on ART in Bahir Dar Town public health facility ART clinics (2016–2019), North-west Ethiopia, 2020. Footnote: proportion was calculated using the formula \( \mathrm{ni}=\mathrm{Ni}\ \left(\frac{\mathrm{n}}{\mathrm{N}}\right) \) as follows: our calculated sample size (424) multiplied by the total number of HIV-infected children on ART at each health facility between 2016 and 2019 (Ni), then divided by the total number of HIV-infected children (N) in the selected public health facilities. For example, for AHC, it was calculated as: 81*424/681 = 50Back to article page