title: Repeat self-harm: application of hurdle models.
abstract: 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.
authors.affiliation: Suicide Studies Unit, St Michael's Hospital, 30 Bond Street, Toronto, Ontario, Canada. bethellj@smh.toronto.on.ca
authors.forename: Jennifer
authors.initials: J
authors.lastname: Bethell
authors.forename: Anne E
authors.initials: AE
authors.lastname: Rhodes
authors.forename: Susan J
authors.initials: SJ
authors.lastname: Bondy
authors.forename: W Y Wendy
authors.initials: WY
authors.lastname: Lou
authors.forename: Astrid
authors.initials: A
authors.lastname: Guttmann
mesh_terms: D000293:Adolescent; D002648:Child; D015331:Cohort Studies; D004636:Emergency Service, Hospital / Q000706:statistics & numerical data*; D005260:Female; D006801:Humans; D008297:Male; D009864:Ontario / Q000453:epidemiology; D012008:Recurrence; D016728:Self-Injurious Behavior / Q000453:epidemiology*; D016008:Statistical Distributions