Impact of the expanded old age income security programme on suicide mortality among older adults in South Korea: a quasi-experimental study

INTRODUCTION: This study examined the impact of the expansion, implemented in July 2014, of Korea's tax-financed (non-contributory) old age income security programme, the Basic Pension (BP), on suicide mortality among individuals aged 65+. METHODS: Using aggregate mortality data from 2010 to 2019, we employed event-history difference-in-differences (DD), 2×2 DD, and difference-in-difference-in-differences (DDD) approaches, leveraging two …