Cause of death | Total | Surface work | Underground work | Surface vs underground | Underground work by number of years* | ||||||
n† | SMR(95% CI) | n† | SMR(95% CI) | n† | SMR(95% CI) | RR(95% CI) | Number of years | n† | SMR(95% CI) | RR(95% CI) | |
Cardio- vascular diseases (ICD10: I00:I999) | 2240 | 1.04 (0.99 to 1.08) | 651 | 1.04 (0.96 to 1.12) | 1589 | 1.04 (0.99 to 1.09) | 1.00 (0.91 to 1.09) | 0–5 | 450 | 1.02 (0.93 to 1.12) | 1– |
5–15 | 552 | 1.07 (0.98 to 1.16) | 1.05 (0.93 to 1.19) | ||||||||
>15 | 587 | 1.02 (0.94 to 1.11) | 1.00 (0.88 to 1.13) | ||||||||
Malignant neoplasms (ICD10: C00:D489) | 972 | 1.04 (0.98 to 1.11) | 252 | 0.93 (0.82 to 1.05) | 720 | 1.09 (1.01 to 1.17) | 1.17 (1.01 to 1.35) | 0–5 | 205 | 1.00 (0.87 to 1.15) | 1– |
5–15 | 244 | 1.09 (0.96 to 1.24) | 1.09 (0.91 to 1.31) | ||||||||
>15 | 271 | 1.16 (1.03 to 1.31) | 1.16 (0.97 to 1.39) | ||||||||
Injuries and poisonings (ICD10: V00:Y999) | 576 | 1.34 (1.24 to 1.46) | 137 | 1.04 (0.87 to 1.23) | 439 | 1.48 (1.34 to 1.62) | 1.42 (1.17 to 1.72) | 0–5 | 206 | 1.55 (1.34 to 1.77) | 1– |
5–15 | 147 | 1.49 (1.26 to 1.75) | 0.96 (0.78 to 1.19) | ||||||||
>15 | 86 | 1.32 (1.06 to 1.63) | 0.85 (0.66 to 1.10) | ||||||||
Respiratory diseases (ICD10: J00:J998) | 253 | 1.14 (1.00 to 1.28) | 68 | 1.06 (0.82 to 1.34) | 185 | 1.17 (1.00 to 1.35) | 1.10 (0.83 to 1.45) | 0–5 | 49 | 1.11 (0.82 to 1.47) | 1– |
5–15 | 64 | 1.20 (0.92 to 1.53) | 1.08 (0.75 to 1.57) | ||||||||
>15 | 72 | 1.18 (0.92 to 1.48) | 1.06 (0.74 to 1.53) | ||||||||
Other | 463 | 0.87 (0.80 to 0.96) | 148 | 0.95 (0.81 to 1.12) | 315 | 0.84 (0.75 to 0.94) | 0.89 (0.73 to 1.08) | 0–5 | 120 | 0.97 (0.80 to 1.16) | 1– |
5–15 | 95 | 0.75 (0.61 to 0.92) | 0.77 (0.59 to 1.01) | ||||||||
>15 | 100 | 0.81 (0.66 to 0.98) | 0.84 (0.64 to 1.09) | ||||||||
Total | 4504 | 1.05 (1.02 to 1.09) | 1256 | 1.01 (0.95 to 1.06) | 3248 | 1.07 (1.04 to 1.11) | 1.07 (1.00 to 1.14) | 0–5 | 1030 | 1.09 (1.02 to 1.16) | 1– |
5–15 | 1102 | 1.08 (1.02 to 1.15) | 0.99 (0.91 to 1.08) | ||||||||
>15 | 1116 | 1.06 (0.99 to 1.12) | 0.97 (0.89 to 1.06) |
*Cumulative employment time; †number of cases. Comparison of mortality rates between surface and underground workers (surface vs underground) are based on Poisson regression. RR, relative risk; SMR, standardised mortality ratio.