Table 4.
Lung Cancer Risk Associated With Hairdressing and Duration of Employment by Start of First Employment in Women Overall (n = 8,585) and in Women by Major Lung Cancer Cell Types in the SYNERGY Project, 1985–2010
| Employment as Hairdressersa | Controls | All Lung Cancer |
Adenocarcinoma |
Squamous Cell Carcinoma |
Small Cell Carcinoma |
||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| No. | No. | OR2 | 95% CI | No. | OR2 | 95% CI | No. | OR2 | 95% CI | No. | OR2 | 95% CI | |
| Never | 5,000 | 3,585 | 1.00 | 1,547 | 1.00 | 736 | 1.00 | 573 | 1.00 | ||||
| Ever (≤1953) | 9 | 22 | 2.66 | 1.09, 6.47 | 10 | 3.10 | 1.14, 8.43 | 7 | 1.80 | 0.48, 6.73 | 3 | 2.51 | 0.44, 14.33 |
| <8 years | 2 | 15 | 12.9 | 2.67, 62.44 | 6 | 14.66 | 2.75, 78.02 | 5 | 14.09 | 1.63, 121.62 | 2 | 50.99 | 4.63, 561.67 |
| 8–26 years | 5 | 4 | 0.67 | 0.13, 3.37 | 1 | 0.50 | 0.05, 5.45 | 2 | 0.56 | 0.07, 4.85 | 1 | 0.78 | 0.03, 21.38 |
| >26 years | 2 | 3 | 0.56 | 0.09, 3.48 | 3 | 1.46 | 0.24, 9.07 | 0 | 0 | ||||
| Ever (>1953) | 50 | 48 | 0.89 | 0.56, 1.40 | 16 | 0.73 | 0.39, 1.35 | 9 | 1.08 | 0.47, 2.45 | 13 | 1.26 | 0.60, 2.65 |
| <8 years | 24 | 22 | 0.67 | 0.35, 1.30 | 8 | 0.65 | 0.28, 1.54 | 3 | 0.49 | 0.13, 1.91 | 6 | 1.12 | 0.40, 3.17 |
| 8–26 years | 15 | 11 | 1.02 | 0.42, 2.50 | 6 | 1.48 | 0.53, 4.12 | 1 | 0.91 | 0.11, 7.85 | 3 | 1.82 | 0.35, 9.37 |
| >26 years | 11 | 15 | 1.28 | 0.51, 3.17 | 2 | 0.30 | 0.06, 1.46 | 5 | 2.92 | 0.80, 10.65 | 4 | 1.23 | 0.32, 4.77 |
Abbreviations: CI, confidence interval; ISCO, International Standard Classification of Occupations 1968; OR2, odds ratio adjusted for age, study, cigarette pack-years, and time since quitting smoking.
a ISCO 5-70.20 and 5-70.30.