Healthcare presentations with self-harm and the association with COVID-19: an e-cohort whole-population-based study using individual-level linked routine electronic health records in Wales, UK, 2016 - March 2021
Background Multi-setting population-based studies on healthcare service presentations with self-harm covering the first 12 months of the COVID-19 pandemic are yet to be published. Aims Ascertain changes across settings in healthcare service presentations with self-harm during Waves 1 and 2 of the COVID-19 pandemic. Method E-cohort study using individual-level linked routine healthcare data from Wales, UK, 2016-March 2021. We measured weekly proportion of self-harm contacts and people who self-harmed in contact with general practice (GP), emergency department (ED) and hospital admissions. We modelled weekly trends using linear regression and generalised estimated equations, quantifying time differences using difference-in-difference (DiD). Results We included 3,552,210 Welsh residents aged ≥10 years. Counts of self-harm presentations across settings was at a minimum at the start of stay-at-home restrictions during both waves and recovered compared to previous years in 3-5 months. Those who self-harmed in April 2020 were more likely to be seen in GP compared to other settings and previous years - mean rate of OR=1.2, although actual numbers fell. The proportion of self-harm ED contacts admitted to hospital dropped from June 2020 (1.9 [1.5-2.3] pp/month). Self-harm and COVID-19 infection had a bidirectional effect - self-harm history had OR=1.4 [1.2-1.6] and incidence had DiD=1.1 [0.8-1.4]. Conclusions Those that self-harmed and sought help during the COVID-19 pandemic potentially encountered stringent criteria for hospitalisation, particularly in Wave 2, while in Wave 1 they preferentially presented to GP. Reductions in contacts likely resulted in unmet healthcare needs which may later emerge placing further burden on individuals and healthcare services.