|  |  | Incidence rate ratios (95% CI) | ||
---|---|---|---|---|---|
 |  |  | Coal gas England and Wales (1919-1935) | Car exhaust gas England and Wales (1975-1992) | Barbecue charcoal gas Taiwan (1999-2006) |
ALL AGES | Â | Â | Â | Â | Â |
 | Males |  |  |  |  |
 |  | All suicides | 1.017 (1.015-1.019) | 1.012 (1.010-1.014) | 1.075 (1.069-1.082) |
 |  | Non gassing | 0.997 (0.995-0.999) | 0.993 (0.991-0.995) | 1.019 (1.012-1.025) |
 |  | Gassing only | 1.106 (1.101-1.110) | 1.072 (1.068-1.076) | 1.401 (1.379-1.423) |
 | Females |  |  |  |  |
 |  | All suicides | 1.032 (1.029-1.034) | 0.959 (0.957-0.962) | 1.053 (1.044-1.062) |
 |  | Non gassing | 1.005 (1.002-1.008) | 0.952 (0.950-0.955) | 1.011 (1.001-1.020) |
 |  | Gassing only | 1.108 (1.102-1.114) | 1.071 (1.061-1.083) | 1.469 (1.426-1.513) |
15-44 years | Â | Â | Â | Â | Â |
 | Males |  |  |  |  |
 |  | All suicides | 1.014 (1.011-1.017) | 1.032 (1.029-1.034) | 1.100 (1.091-1.110) |
 |  | Non gassing | 0.992 (0.989-0.995) | 1.012 (1.009-1.015) | 1.017 (1.007-1.027) |
 |  | Gassing only | 1.105 (1.097-1.112) | 1.079 (1.074-1.084) | 1.434 (1.406-1.463) |
 | Females |  |  |  |  |
 |  | All suicides | 1.030 (1.026-1.034) | 0.972 (0.967-0.976) | 1.070 (1.057-1.084) |
 |  | Non gassing | 1.006 (1.002-1.011) | 0.959 (0.954-0.963) | 0.997 (0.982-1.011) |
 |  | Gassing only | 1.108 (1.099-1.118) | 1.087 (1.072-1.103) | 1.461 (1.413-1.511) |
45-64 years | Â | Â | Â | Â | Â |
 | Males |  |  |  |  |
 |  | All suicides | 1.018 (1.015-1.020) | 0.998 (0.995-1.001) | 1.060 (1.049-1.072) |
 |  | Non gassing | 0.998 (0.996-1.001) | 0.978 (0.975-0.982) | 1.016 (1.005-1.028) |
 |  | Gassing only | 1.101 (1.095-1.108) | 1.063 (1.056-1.070) | 1.399 (1.355-1.445) |
 | Females |  |  |  |  |
 |  | All suicides | 1.026 (1.022-1.030) | 0.957 (0.954-0.961) | 1.034 (1.018-1.051) |
 |  | Non gassing | 0.998 (0.993-1.003) | 0.951 (0.947-0.955) | 0.997 (0.980-1.013) |
 |  | Gassing only | 1.099 (1.090-1.107) | 1.060 (1.042-1.077) | 1.544 (1.446-1.648) |
65+ years | Â | Â | Â | Â | Â |
 | Males |  |  |  |  |
 |  | All suicides | 1.010 (1.006-1.014) | 0.989 (0.985-0.993) | 1.020 (1.007-1.033) |
 |  | Non gassing | 0.991 (0.986-0.995) | 0.980 (0.976-0.984) | 1.013 (1.000-1.026) |
 |  | Gassing only | 1.109 (1.097-1.121 | 1.065 (1.052-1.078) | 1.536 (1.369-1.723) |
 | Females |  |  |  |  |
 |  | All suicides | 1.035 (1.026-1.043) | 0.951 (0.947-0.955) | 1.014 (0.997-1.032) |
 |  | Non gassing | 1.006(0.997-1.015) | 0.950 (0.945-0.954) | 1.012 (0.995-1.029) |
 |  | Gassing only | 1.114 (1.097-1.133) | 1.059 (1.022-1.098) | 1.415 (1.109-1.804) |