3.6. Sample Size 
STIS
It has been estimated that a total of 382 HIV-infected women would determine the effectiveness of the clinic-based HPV sampling approach. In each arm, i.e., the clinic-based and the home-based HPV self-sampling, there would be 191 participants. The required powered sample for this sub-study has been determined based on the formula for comparative studies where the outcome is categorical (or a proportion) (Schlesselman, 1982). To answer the question of the facilitators and barriers to HPV screening in the rural HIV clinic, we would conduct 24 in-depth interviews (IDIs) among women aged 25–35 years and 36–49 years, including women who would decline CC screening, with or without a history of STIs, as indicated in The phenomenology design would be used to explore the deeper facilitators and barriers toward women regarding self-sampling, either at home or in clinical settings, in Luweero District Hospital, Uganda. The in-depth interview (IDI) guide would be translated from English to Luganda. Qualitative data analysis would be guided by content analysis techniques. The transcripts would be coded in NVivo 20.7.0. The coded text would then be used to generate categories of analytically meaningful data that guided the formation of themes, the interpretation of results, and the final write-up.