, 2008). In brief, email invitations, containing a hyperlink to the study information

page, were sent to 5653 contestants who provided their email addresses at registration for the event. Those who agreed to participate in the study were taken to the next page containing a web questionnaire and asked about demographic characteristics, general cycling activity and crash experience in the past twelve months, and habitual risk/protective behaviours with options ranging from never to always. Copies of the questionnaire can be obtained from the authors. The questionnaire was completed and submitted by 2438 cyclists (43.1% response rate). Another 190 cyclists were recruited from the 2008 event by including a short description about the study in the event newsletter. Ethical approval was obtained from the University of Auckland Human Participants’ Ethics Committee. All participants were resurveyed in 2009 using a web questionnaire. buy PD-0332991 The questionnaire asked about changes in cycling activity and risk/protective behaviours, as well as crash experience in the past twelve months, and was completed by 1537 cyclists (58.5% response rate). Injury outcome data were collected through record linkage to four administrative databases, covering the period from the date of recruitment to 30 June 2011. All participants

consented to link their data to the following databases. In New Zealand, ACC provides personal injury cover for all residents and temporary visitors to New Zealand no matter who buy Screening Library is at fault. The claims database is a major source of information on relatively minor injuries with over 80% of the claims related to primary care (e.g., GPs, emergency room treatment) only (Accident Compensation Corporation, 2012). Approval for record linkage was obtained from the ACC Research Ethics Committee. The hospital discharge data contains information about inpatients and day patients discharged from all public hospitals and over 90% of private hospitals in New Zealand. The mortality data contains information from about all deaths registered in New Zealand. Diagnoses

in each hospital visit and underlying causes of death are coded under ICD-10-AM. Bicycle crashes were identified using the E codes V10-V19; those that occurred on public roads were identified using the E codes V10-V18.3-9, V19.4-6, V19.9; and those that involved a collision with a motor vehicle were identified using the E codes V12-V14, V19.0-2 and V19.4-6. Readmissions were identified as described previously (Davie et al., 2011) and excluded. In New Zealand, it is mandatory that any fatal or injury crash involving a collision with a motor vehicle on a public road be reported to the police. This database therefore contains information on all police-reported bicycle collisions. There was a 99.0% match rate by the National Health Index number. The completeness of the linked data, based on the capture–recapture models, was 73.7% for all crashes, 74.5% for on-road crashes and 83.