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Table 2 Incidence rate ratios for suicide and 95% confidence intervals by sex for all ages and 3 age groups

From: Suicide epidemics: the impact of newly emerging methods on overall suicide rates - a time trends study

    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      
  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      
  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      
  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      
  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)