Table 3.
Incidence risk ratio (IRR) of lung cancer and its subtypes in total and by gender
| Person-year at risk (years) | Lung cancer | LA | Non-LAa | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Case | IR/105 (years) | Crude IRR (95% CI) | Adjustedb IRR (95% CI) | Case | IR/105 (years) | Crude IRR (95% CI) | Adjustedb IRR (95% CI) | Case | IR/105 (years) | Crude IRR (95% CI) | Adjustedb IRR (95% CI) | ||
| Total | |||||||||||||
| Non-Chinese food chefs | 544,690 | 19 | 3.49 | 1.00 | 1.00 | 12 | 2.20 | 1.00 | 1.00 | 7 | 1.29 | 1.00 | 1.00 |
| Chinese food chefs | 3,675,473 | 320 | 8.71 | 2.50 (1.57–3.97) | 1.46 (0.91–2.34) | 223 | 6.07 | 2.75 (1.54–4.92) | 1.26 (0.69–2.29) | 97 | 2.64 | 2.05 (0.95–4.42) | 1.37 (0.63–2.98) |
| Years of certification (years) | |||||||||||||
| ≤ 5 | 1,656,756 | 65 | 3.92 | 1.12 (0.67–1.88) | 0.66 (0.39–1.10) | 44 | 2.66 | 1.21 (0.64–2.28) | 0.36 (0.19–0.70) | 21 | 1.27 | 0.99 (0.42–2.32) | 0.66 (0.28–1.56) |
| 2.12 (1.32–3.40) | |||||||||||||
| > 5 | 2,018,717 | 255 | 12.63 | 3.62 (2.27–5.77) | 179 | 8.87 | 4.02 (2.24–7.22) | 2.26 (1.24–4.10) | 76 | 3.76 | 2.93 (1.35–6.35) | 1.95 (0.89–4.28) | |
| Female | |||||||||||||
| Non-Chinese food chefs | 311,439 | 4 | 1.28 | 1.00 | 1.00 | 3 | 0.96 | 1.00 | 1.00 | 1 | 0.32 | 1.00 | 1.00 |
| Chinese food chefs | 2,571,411 | 214 | 8.32 | 6.48 (2.41–17.43) | 3.32 (1.23–9.02) | 170 | 6.61 | 6.86 (2.19–21.49) | 3.56 (1.13–11.25) | 44 | 1.71 | 5.33 (0.73–38.68) | 2.62 (0.35–19.42) |
| Years of certification (years) | |||||||||||||
| ≤ 5 | 1,159,275 | 47 | 4.05 | 3.16 (1.14–8.76) | 1.61 (0.58–4.51) | 37 | 3.19 | 3.31 (1.02–10.75) | 1.71 (0.52–5.60) | 10 | 0.86 | 2.69 (0.34–20.99) | 1.31 (0.17–10.47) |
| > 5 | 1,412,136 | 167 | 11.83 | 9.21 (3.42–24.82) | 4.73 (1.74–12.86) | 133 | 9.42 | 9.78 (3.11–30.70) | 5.08 (1.60–16.09) | 34 | 2.41 | 7.50 (1.03–54.78) | 3.70 (0.50–27.57) |
| Male | |||||||||||||
| Non-Chinese food chefs | 233,252 | 15 | 6.43 | 1.00 | 1.00 | 9 | 3.86 | 1.00 | 1.00 | 6 | 2.57 | 1.00 | 1.00 |
| Chinese food chefs | 1,104,062 | 106 | 9.60 | 1.49 (0.87–2.56) | 0.95 (0.55–1.64) | 53 | 4.80 | 1.24 (0.61–2.52) | 0.81 (0.39–1.66) | 53 | 4.80 | 1.87 (0.80–4.34) | 1.15 (0.49–2.70) |
| Years of certification (years) | |||||||||||||
| ≤ 5 | 497,481 | 18 | 3.62 | 0.56 (0.28–1.12) | 0.36 (0.18–0.72) | 7 | 1.41 | 0.36 (0.14–0.98) | 0.24 (0.09–0.65) | 11 | 2.21 | 0.86 (0.32–2.32) | 0.53 (0.20–1.46) |
| > 5 | 606,581 | 88 | 14.51 | 2.26 (1.30–3.90) | 1.42 (0.82–2.48) | 46 | 7.58 | 1.97 (0.96–4.02) | 1.27 (0.62–2.63) | 42 | 6.92 | 2.69 (1.14–6.33) | 1.65 (0.70–3.93) |
Bold values indicate p < 0.05
LA lung adenocarcinoma
aIncluding small cell and non-small cell lung cancer except lung adenocarcinoma
bAdjusting for age range (15–39, 40–59, and ≥ 60 years old) and gender