Table 2

 Comparison of men who in 1991, aged 33 years, worked in “target” occupations, according to colour vision status

OccupationNormal colour visionColour vision defectDifference in proportion
n = 3665n = 267% normal – % CVD
n%n%% difference95% CIp value
*Preclusion on basis of safety.
†Preclusion on basis of quality of product.
Armed forces*230.620.8−0.1−1.2 to 0.90.82
Transport operation*60.2000.20.03 to 0.30.01
Aircraft and ships’ officers*110.3000.30.1 to 0.50.001
Police, fire-fighting, and protective services*1183.262.31.0−0.9 to 2.80.31
Electrical and electronic engineering*150.4000.40.2 to 0.6<0.001
Electrical fitting and wiring*110.310.4−0.07−0.8 to 0.70.85
Electrical installation and maintenance*742.041.50.5−1.0 to 2.00.50
Medicine, pharmacy, health diagnosing, and treatment*†250.741.5−0.8−2.3 to 0.70.28
Laboratory and engineering technology*†471.341.5−0.2−1.7 to 1.30.78
Painting and related coating†391.131.1−0.06−1.4 to 1.20.93
Fibre and textile processing†180.5000.50.3 to 0.7<0.001
Wood processing and paper making†10.03000.03−0.03 to 0.080.32
Horticulture†230.620.8−0.1−1.2 to 0.90.82
Biological, chemical, and geological science†180.520.8−0.3−1.3 to 0.80.63
Printing, paper, and photographic processing†150.410.40.03−0.7 to 0.80.93
Art, sculpture, photography, and industrial design†210.6000.60.3 to 0.8<0.001
Total in “target” occupations46512.72910.91.8−2.1 to 5.70.36