Fig. 2
Interrupted time series analysis of the monthly incidence rate of under 5 AGE1 admissions in the pre- (January 2010–December 2013) and post-rotavirus vaccine (January 2016–September 2017) periods2, Tarawa, Kiribati. 1AGE = acute gastroenteritis. 2 Rotavirus vaccine was introduced in August 2015. Legend: The purple solid line is the pre-rotavirus vaccine trend based on the model fitted to the observed data in the pre- vaccine period; the purple dashed line is extrapolated from the model fitted to the pre- vaccine data and represents the counterfactual trend that would be expected if the vaccine had not been introduced; the orange solid line is the post-vaccine trend based on the model fitted to the observed data two years post- vaccine introduction