Quantifying the indirect impact of COVID-19 pandemic on utilisation of outpatient and immunisation services in Kenya: a longitudinal study using interrupted time series analysis.

Objective: In this study, we assess the indirect impact of COVID-19 on utilisation of immunisation and outpatient services in Kenya.

Design: Longitudinal study.

Setting: Data were analysed from all healthcare facilities reporting to Kenya's health information system from January 2018 to March 2021.