Poisson regression analysis of yearly suicide rates by jumping from height and by other means in Toronto prebarrier (1993–2003) and postbarrier (2004–June 2014)
| Subgroup | Suicides prebarrier mean number per year | Suicides postbarrier mean number per year | Regression coefficient | SE | p Value | IRR (95% CI)* | ||
| Observed | Corrected† | Observed | Corrected† | |||||
| Toronto (total) | 257.0 | 247.8 | 234.2 | 211.7 | −0.16 | 0.04 | <0.001 | 0.85 (0.79 to 0.93) |
| Jumping | 59.3 | 57.0 | 56.7 | 51.3 | −0.11 | 0.06 | 0.07 | 0.90 (0.80 to 1.01) |
| Building | 39.6 | 38.1 | 45.5 | 41.2 | 0.08 | 0.07 | 0.29 | 1.08 (0.94 to 1.24) |
| Bridge | 19.6 | 18.8 | 11.1 | 10.0 | −0.63 | 0.15 | <0.0001 | 0.53 (0.40 to 0.71) |
| Bloor Street Viaduct | 9.5 | 9.0 | 0.1 | 0.1 | −4.68 | 1.54 | 0.002 | 0.009 (0.0005 to 0.19) |
| Other bridges | 10.1 | 9.6 | 11.0 | 10.0 | 0.03 | 0.15 | 0.84 | 1.03 (0.76 to 1.40) |
| Walking distance bridges | 6.7 | 6.3 | 5.5 | 5.0 | −0.24 | 0.26 | 0.36 | 0.79 (0.48 to 1.30) |
| Nearest comparison bridge | 2.3 | 2.2 | 2.6 | 2.4 | 0.11 | 0.37 | 0.77 | 1.11 (0.54 to 2.29) |
| Other means | 197.7 | 190.8 | 177.5 | 160.4 | −0.17 | 0.05 | 0.001 | 0.84 (0.76 to 0.93) |
*IRR of suicides postbarrier compared with prebarrier; df=15.
† Corrected per capita to suicides per 1993 population; not age standardised.
IRR, incidence rate ratio.