Monthly frequencies in suicides in Switzerland, 1881–1920 and 1969–2000, by suicide method†
| Suicide method | 1881–1920 | 1969–2000 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Number | χ2 (2 df) | Peak-low ratio | Lower CI | Upper CI | Number | χ2 (2 df) | Peak-low ratio | Lower CI | Upper CI | |
| †Poisoning by gas, run over by train, etc, were omitted because of low frequencies in the first period or in both periods. *p<0.05; **p<0.01; ***p<0.001. Edwards’ test χ2 values, peak-low ratios and 95% confidence intervals. | ||||||||||
| Poisoning by solid or liquid substance | 1272 | 0.9 | 1.08 | 1.00 | 1.26 | 6336 | 5.3 | 1.09 | 1.01 | 1.16 |
| Hanging, strangulation | 12129 | 357.5*** | 1.64 | 1.56 | 1.73 | 11635 | 44.0*** | 1.19 | 1.13 | 1.25 |
| Drowning | 6614 | 444.7*** | 2.16 | 2.00 | 2.34 | 4177 | 82.7*** | 1.50 | 1.37 | 1.64 |
| Firearms, explosives | 6351 | 48.3*** | 1.28 | 1.19 | 1.38 | 10902 | 7.6* | 1.08 | 1.02 | 1.14 |
| Cutting, piercing | 1313 | 28.7*** | 1.53 | 1.30 | 1.79 | 862 | 1.5 | 1.13 | 1.00 | 1.36 |
| Jumping from high places | 907 | 15.4*** | 1.45 | 1.20 | 1.76 | 4664 | 17.7*** | 1.19 | 1.10 | 1.29 |