COVID-19 vaccine hesitancy: a systematic review of barriers to the uptake of COVID-19 vaccine among adults in Nigeria

Abstract

A total of 161 records identified from the four databases were exported into Rayyan systematic review software and duplicates were removed, leaving 148 records to be screened (Fig. 2). The kappa test of inter-rater agreement between reviewers was 0.83. Full-text screening was conducted to further assess the remaining 23 articles for eligibility before data extraction. Eight articles were excluded mainly due to being the wrong publication type (n = 4) or having the wrong outcome (n = 4). At the end of the process, 15 articles were eligible for inclusion in the review with an inter-rater agreement of κ = 0.95.