Non-fatal repetition of self-harm: population-based prospective cohort study in Taiwan.

BACKGROUND: Repeated self-harm is relatively common and is linked with an elevated risk of eventual suicide. There has been no study of this involving a large sample from the Far East. AIMS: To estimate the risk over the medium term of non-fatal repetition of self-harm and identify predictive factors in those carrying out self-harm. METHOD: A total of 970 individuals who had self-harmed were recruited from a community-based suicide behaviour register system in Nantou, Taiwan from July 2000 to February 2003. Information regarding demography and suicide methods was collected. Individuals were followed-up until December 2005 to examine the risk of repeated self-harm and independent predictive factors. RESULTS: Ninety cohort members had repeated self-harm during the follow-up period (accounting for 131 repeated self-harm episodes in all). The cumulative risks were 5.7% for the first year, 7.8% for the second year and 9.5% for the fourth year. The risk was highest within the first year after the self-harm event. Independent risk factors included female gender and self-cutting as well as self-poisoning with drugs. Effect of younger age was mediated through the choice of methods. CONCLUSIONS: Individuals with self-harm have a high risk of repetition, especially within the first year. Suicide prevention strategies need to focus on intervening with this population to reduce their repetition.