RESEARCH BMJ: first published as 10.1136/bmj.c2884 on 6 July 2010. Downloaded from Effect of a barrier at Bloor Street Viaduct on suicide rates in Toronto: natural experiment Mark Sinyor, resident physician,1,2 Anthony J Levitt, psychiatrist in chief2 1Department of Psychiatry, ABSTRACT related suicides decreased after the introduction of leg- University of Toronto, ON, Canada Objective To determine whether rates of suicide changed islation for gun control,67although some evidence sug- 2 Department of Psychiatry, in Toronto after a barrier was erected at Bloor Street Sunnybrook Health Sciences gests that these reductions were matched by increases 89 Centre and Women’s College Viaduct, the bridge with the world’s second highest in suicides by other means, such as jumping. Hospital. 2075 Bayview Avenue, annual rate of suicide by jumping after Golden Gate Barriers to prevent jumping have been established at Toronto, ON, Canada M4N 3M5 Bridge in San Francisco. the Empire State Building, the Eiffel Tower, and sev- Correspondence to: M Sinyor 10 11
[email protected] Design Natural experiment. eral bridges worldwide. Recent arguments in Setting City of Toronto and province of Ontario, Canada; favour of barriers on bridges used for suicide stem Cite this as: BMJ 2010;341:c2884 records at the chief coroner’s office of Ontario 1993-2001 doi:10.1136/bmj.c2884 from studies in the 1970s that assessed the survivors (nine years before the barrier) and July 2003-June 2007 of suicide attempts at Golden Gate Bridge in San Fran- (four years after the barrier). cisco, the bridge with the world’s highest annual rate of Participants 14 789 people who completed suicide in the suicide by jumping.10 In one study, four of six survivors city of Toronto and in Ontario.