Table 10

Rate ratios* and 95% CI by cumulative exposure to hydrogen sulphide (H2S) for selected† non-malignant causes of death among males from a Canadian petroleum company, 1964–94

Hydrogen sulphide (ppm-years)Non-malignant respiratory disease‡ (ICD 9th revision 460–519)Suicide (ICD 9th revision E950–E959)Transportation accidents§
*All models include terms for age and calendar period. Number (n) is number of cases in exposure category.
†Other causes of death evaluated but not shown due to less than 10 exposed cases includes neurological disorders (320–389), deaths due to accidental poisoning by other gases and vapours (E869.8) and accidental falls (E880–E888) (numbers in parentheses are ICD 9th revision codes).
‡Model includes additional term for smoking (ever v never/unknown).
§Transportation accidents based on 9th revision ICD codes for motor vehicle accidents (E810–E819), motor vehicle non-traffic accidents (E820–E825), other road vehicle accidents (E826–E829), water transport accidents (E830–E838), and air & space transport accidents (E840–E845). Passengers were excluded from the analysis to the extent possible based on the 4th digit of the ICD code when specified.
¶Exposure category combined with category above due to no or small number of cases. Rate ratio and confidence interval is based on observed counts in each cell combined. The counts shown in each cell are the original counts before combined categories.
**95% CI does not include value of 1.0.
n = 5n = 19n = 23
>0–<0.1 ppm-years1.8 (0.5 to 6.8)1.3 (0.6 to 2.7)1.2 (0.6 to 2.3)
n = 4n = 12n = 13
⩾0.1–<1.5 ppm-years2.2 (0.7 to 7.3)1.0 (0.4 to 2.3)1.8 (0.9 to 3.3)
n = 6n = 8n = 17
⩾1.5 ppm-years0.9 (0.3 to 2.3)2.3 (1.2 to 4.4)**
n = 0n = 5n = 15