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Estimating Incidence Rate of Hospital-Treated Self-Harm in Hong Kong Using Capture-Recapture Approach.
Crisis 2018 May
BACKGROUND: A surveillance system for self-harm has not been established in Hong Kong. The existing data source has an unknown degree of underreporting, and therefore a capture-recapture method has been proposed to correct for the incompleteness.
AIMS: To assess the underestimation of the incidence of self-harm cases presenting to hospital in Hong Kong using a capture and recapture method.
METHOD: Two different yet overlapping hospital administrative datasets of self-harm were obtained from all public hospitals in Hong Kong. From 2002 to 2011, 59,473 distinct episodes involving 36,411 patients were identified. A capture-recapture model considering heterogeneous capture probabilities was applied to estimate the number of self-harm episodes.
RESULTS: The estimated number of self-harm incidence was 79,923, equally shared by females and males. Cases of self-harm by females were more likely to be ascertained than those by males. The estimated annual incidence rate of self-harm in Hong Kong from 2002 to 2011 ranged from 96.4 in 2010 to 132.7 in 2002.
LIMITATIONS: The proposed method does not include patients who required no medical attention and those where the patient consulted private doctors.
CONCLUSION: The capture-recapture model is a useful method for adjusting the underestimation of self-harm cases from existing databases when surveillance system is not available and to reveal some hidden patterns.
AIMS: To assess the underestimation of the incidence of self-harm cases presenting to hospital in Hong Kong using a capture and recapture method.
METHOD: Two different yet overlapping hospital administrative datasets of self-harm were obtained from all public hospitals in Hong Kong. From 2002 to 2011, 59,473 distinct episodes involving 36,411 patients were identified. A capture-recapture model considering heterogeneous capture probabilities was applied to estimate the number of self-harm episodes.
RESULTS: The estimated number of self-harm incidence was 79,923, equally shared by females and males. Cases of self-harm by females were more likely to be ascertained than those by males. The estimated annual incidence rate of self-harm in Hong Kong from 2002 to 2011 ranged from 96.4 in 2010 to 132.7 in 2002.
LIMITATIONS: The proposed method does not include patients who required no medical attention and those where the patient consulted private doctors.
CONCLUSION: The capture-recapture model is a useful method for adjusting the underestimation of self-harm cases from existing databases when surveillance system is not available and to reveal some hidden patterns.
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