Risk from exposure to different sources of EMF (OR, 95% CI), stratified by eye colour
| Exposure | Dark eye colour† | Light eye colour† | ||||
| Cases/controls exposed, n | OR1 (95% CI) | OR2 (95% CI) | Cases/controls exposed, n | OR1 (95% CI) | OR2 (95% CI) | |
| Any electrical transmission installation* | 2/66 | 0.62 (0.15 to 2.62) | 0.72 (0.16 to 3.17) | 17/100 | 1.85 (1.07 to 3.19) | 1.79 (1.01 to 3.16) |
| Transformers or substations* | 2/41 | 1.03 (0.24 to 4.42) | 1.09 (0.24 to 4.88) | 10/54 | 2.08 (1.03 to 4.19) | 2.15 (1.05 to 4.41) |
| Overhead high-voltage power lines* | 2/44 | 0.96 (0.22 to 4.13) | 1.09 (0.24 to 4.88) | 10/62 | 1.68 (0.84 to 3.34) | 1.51 (0.72 to 3.14) |
| Any electrical machine | 13/294 | 0.89 (0.46 to 1.72) | 0.95 (0.47 to 1.92) | 57/578 | 0.92 (0.66 to 1.27) | 0.90 (0.64 to 1.28) |
| Machine tools | 7/160 | 0.89 (0.39 to 2.04) | 1.71 (0.90 to 3.24) | 33/325 | 1.03 (0.69 to 1.54) | 1.08 (0.71 to 1.64) |
| Ovens or furnaces | 7/107 | 1.44 (0.63 to 3.28) | 1.45 (0.59 to 3.52) | 25/187 | 1.35 (0.86 to 2.11) | 1.21 (0.75 to 1.95) |
| Lifting trucks | 1/56 | 0.36 (0.05 to 2.68) | 0.32 (0.04 to 2.47) | 8/110 | 0.81 (0.05 to 2.68) | 0.85 (0.40 to 1.81) |
| Other electrical machines | 6/105 | 1.21 (0.50 to 2.92) | 1.37 (0.55 to 3.38) | 17/212 | 0.67 (0.40 to 1.13) | 0.67 (0.39 to 1.15) |
| Welding apparatus | 2/53 | 0.78 (0.18 to 3.33) | 0.52 (0.10 to 2.76) | 19/110 | 1.85 (1.11 to 3.11) | 1.59 (0.88 to 2.87) |
| Any room with a complex electronic device* | 10/82 | 3.25 (1.53 to 6.92) | 3.78 (1.70 to 8.44) | 27/200 | 1.32 (0.85 to 2.04) | 1.38 (0.87 to 2.18) |
| Computer rooms* | 4/46 | 2.14 (0.71 to 6.44) | 2.52 (0.80 to 7.93) | 10/104 | 0.99 (0.50 to 1.94) | 1.23 (0.62 to 2.45) |
| Control or computer rooms* | 10/65 | 4.46 (2.04 to 9.76) | 5.80 (2.48 to 13.57) | 18/145 | 1.32 (0.78 to 2.23) | 1.46 (0.84 to 2.51) |
| Telephone switchboards | 1/20 | 1.05 (0.14 to 7.98) | 0.88 (0.11 to 7.02) | 9/52 | 1.46 (0.70 to 3.01) | 1.59 (0.75 to 3.35) |
| Computer screens* | 15/160 | 2.81 (1.40 to 5.63) | 3.06 (1.42 to 6.61) | 41/421 | 0.92 (0.63 to 1.33) | 1.03 (0.69 to 1.54) |
| Source of radiation | 0/12 | NE | NE | 3/24 | 1.29 (0.38 to 4.36) | 0.83 (0.19 to 3.59) |
Eye colour stratified ORs (OR1 and OR2): OR1 is adjusted for sex, 5-year age groups and country only. OR2 is additionally adjusted for eye colour, skin colour, frequency of ocular damage due to intense UV exposure, alcohol consumption and education.
Reference subjects are subjects unexposed to respective source of EMF.
↵* Differences in numbers as compared to tables 1 and 2 are due to missing values in eye colour.
↵† Difference in OR by eye colour for all analyses: p>0.05.
EMF, electromagnetic fields; NE, not estimable.