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Repeat self-harm: application of hurdle models

Bethell J, Rhodes AE, Bondy SJ, Lou WY, Guttmann A. Br J Psychiatry. 2010; 196(3):243-4.

Among those who present to the emergency department for self-harm, many will repeat. Self-harm repetition is an outcome of interest in both observational and intervention studies. However, few such studies analyse the number of repeat self-harm presentations. Here, hurdle models are introduced as a potentially useful statistical method for these analyses. Emergency department data from the Province of Ontario, Canada, are used to illustrate an example of implementing hurdle models and interpreting their results.

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Keywords: Research and statistical methods Mental health