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Incidence of Deliberate Self-Harm in Hong Kong Before and During the COVID-19 Pandemic: Population-Wide Retrospective Cohort Study

Incidence of Deliberate Self-Harm in Hong Kong Before and During the COVID-19 Pandemic: Population-Wide Retrospective Cohort Study

Fisher exact and Mann-Whitney U tests were used to compare DSH incidences, sex, age groups, and co-occurring mental health issues. Next, a quasi-experiment was conducted using an interrupted time series (ITS) design to estimate the impact of the COVID-19 pandemic on DSH-related ED visits. Quasi-experiments estimate causal relationships between different factors and outcomes when random assignment is not possible.

Luke Y F Luk, Christie J Y Ching, Tsz Fung Yip, Sunny C L Chan, Catherine Y T Lam, Elizabeth T C Lam, Serena R B Yue, Hoi Ching Pang, Janet Y H Wong, Carlos K H Wong, Chak Kwan Tong, Tafu Yamamoto, Timothy H Rainer, Abraham K C Wai, Joshua W K Ho

JMIR Public Health Surveill 2025;11:e57500