# Incidence and case fatality of stroke in Korea, 2011-2020

## TL;DR

This study analyzed stroke incidence and fatality rates in Korea from 2011 to 2020, finding a decline in age-standardized rates but an increase in total cases due to aging.

## Contribution

The study provides updated trends in stroke incidence and case fatality rates in Korea, highlighting the impact of an aging population.

## Key findings

- The crude stroke incidence rate increased until 2019 but decreased in 2020.
- Age-standardized incidence rates declined by 25% from 2011 to 2020.
- Case fatality rates decreased from 2011 to 2019 but increased in 2020.

## Abstract

Stroke remains the second leading cause of death in Korea. This study was designed to estimate the crude, age-adjusted and age-specific incidence rates, as well as the case fatality rate of stroke, in Korea from 2011 to 2020.

We utilized data from the National Health Insurance Services from January 1, 2002 to December 31, 2020, to calculate incidence rates and 30-day and 1-year case fatality rates of stroke. Additionally, we determined sex and age-specific incidence rates and computed age-standardized incidence rates by direct standardization to the 2005 population.

The crude incidence rate of stroke hovered around 200 (per 100,000 person-years) from 2011 to 2015, then surged to 218.4 in 2019, before marginally declining to 208.0 in 2020. Conversely, the age-standardized incidence rate consistently decreased by 25% between 2011 and 2020. When stratified by sex, the crude incidence rate increased between 2011 and 2019 for both sexes, followed by a decrease in 2020. Age-standardized incidence rates displayed a downward trend throughout the study period for both sexes. Across all age groups, the 30-day and 1-year case fatality rates of stroke consistently decreased from 2011 to 2019, only to increase in 2020.

Despite a decrease in the age-standardized incidence rate, the total number of stroke events in Korea continues to rise due to the rapidly aging population. Moreover, 2020 witnessed a decrease in incidence but an increase in case fatality rates.