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Table 5 Age adjusted relative risk for BCC, all and of trunk, by employment years, cumulative air hours, cumulative mSv, and cumulative mSv up to age of 40 years

From: Incidence of cancer among licenced commercial pilots flying North Atlantic routes

  Basal cell carcinoma of skin, all (C44)a Basal cell carcinoma of skin, of trunk (C44)a
Exposure No Yes   No Yes  
metrics n = 520 n = 31 RR (95% CI) n = 540 n = 11 RR (95% CI)
Employment years
 Unexposed 256 9 1.00 (Referent) 263 2 1.00 (Referent)
 <15 127 5 2.95 (0.70 to 12.74) 130 2 4.29 (0.35 to 65.08)
 15+ 137 17 3.34 (1.51 to 7.89) 147 7 6.07 (1.46 to 40.86)
 p-trend    0.002    0.01
Cumulative air hours
 Unexposed 232 33 1.00 (Referent) 253 12 1.00 (Referent)
 <10,000 163 7 1.40 (0.49 to 3.73) 170 0
 10,000+ 79 37 2.41 (1.50 to 3.90) 101 15 2.61 (1.22 to 5.60)
 p-trend    0.0003    0.002
Cumulative mSv
 Unexposed 256 9 1.00 (Referent) 263 2 1.00 (Referent)
 <25 146 5 1.92 (0.49 to 7.23) 149 2 2.75 (0.25 to 33.24)
 25+ 118 17 3.61 (1.64 to 8.48) 128 7 6.65 (1.61 to 44.64)
 p-trend    0.0005    0.005
Cumulative mSv up to age of 40 years
 Unexposed 256 9 1.00 (Referent) 263 2 1.00 (Referent)
 <5 122 3 1.37 (0.27 to 5.74) 123 2 4.51 (0.40 to 54.67)
 5+ 142 19 3.62 (1.68 to 8.45) 154 7 6.08 (1.46 to 41.06)
 p-trend    0.0006    0.01
  1. Abbreviations: MilliSievert (mSv), relative risk (RR), confidence interval (CI)
  2. aNot included in all cancers