ORs and 95% CIs for occupation by duration categories
| Occupation† | Never/ever Cases/controls (n) | Never/ever OR (95% CI)‡ | Exposure <2 years Cases/controls (n) | Exposure <2 years OR (95% CI)‡ | Exposure between 2 years and 10 years Cases/controls (n) | Exposure between 2 years and 10 years OR (95% CI)‡ | Exposure >10 years Cases/controls (n) | Exposure >10 years OR (95% CI)‡ | Trend p value |
| 1: legislators, administrators and Managers | 84/169 | 0.83 (0.60 to 1.14) | 4/21 | 0.30 (0.10 to 0.90)* | 33/43 | 1.28 (0.78 to 2.10) | 42/98 | 0.71 (0.47 to 1.07) | 0.232 |
| 2: professionals | 109/254 | 0.75 (0.54 to 1.05) | 11/19 | 1.00 (0.45 to 2.19) | 25/62 | 0.69 (0.41 to 1.18) | 63/155 | 0.69 (0.47 to 1.03) | 0.050 |
| 3: technicians and associate professionals | 103/197 | 0.97 (0.72 to 1.32) | 16/26 | 1.15 (0.59 to 2.24) | 27/63 | 0.78 (0.48 to 1.29) | 45/77 | 1.05 (0.70 to 1.59) | 0.877 |
| 31141: telecommunications technician | 8/4 | 4.20 (1.20 to 14.64)* | 0/0 | – | 2/0 | – | 2/1 | 3.15 (0.26 to 38.79) | 0.102 |
| 3118: draughting technicians | 9/7 | 3.02 (1.07 to 8.53)* | 2/1 | 6.17 (0.53 to 72.08) | 4/0 | – | 1/3 | 0.80 (0.08 to 7.83) | 0.122 |
| 3342: education associate professionals | 2/20 | 0.23 (0.05 to 1.00)* | 1/2 | 0.92 (0.08 to 10.58) | 0/9 | – | 0/1 | – | 0.119 |
| 4: clerks | 90/238 | 0.62 (0.45 to 0.86)* | 12/36 | 0.54 (0.27 to 1.08) | 31/81 | 0.61 (0.38 to 0.97)* | 29/85 | 0.61 (0.38 to 0.99)* | 0.008 |
| 5: service and sales workers | 130/205 | 1.40 (1.04 to 1.90)* | 25/41 | 1.23 (0.71 to 2.12) | 46/63 | 1.65 (1.06 to 2.55)* | 42/64 | 1.49 (0.95 to 2.33) | 0.015 |
| 51: personal and protective services workers | 89/131 | 1.46 (1.04 to 2.04)* | 23/26 | 1.84 (1.00 to 3.40) | 29/44 | 1.41 (0.84 to 2.37) | 26/38 | 1.47 (0.84 to 2.55) | 0.048 |
| 52113: forecourt attendant | 11/2 | 8.31 (1.79 to 38.54)* | 4/0 | – | 3/1 | 4.37 (0.44 to 43.34) | 3/0 | – | 0.030 |
| 6: agriculture and fishery workers | 106/144 | 1.66 (1.21 to 2.29)* | 17/24 | 1.50 (0.76 to 2.96) | 26/27 | 1.96 (1.09 to 3.54)* | 48/59 | 1.91 (1.23 to 2.95)* | 0.001 |
| 61: market-oriented agricultural and fishery workers | 106/144 | 1.66 (1.21 to 2.29)* | 17/24 | 1.50 (0.76 to 2.96) | 26/27 | 1.96 (1.09 to 3.54)* | 48/59 | 1.91 (1.23 to 2.95)* | 0.001 |
| 611: market farmers and crop growers | 47/46 | 2.15 (1.37 to 3.38)* | 10/12 | 1.52 (0.62 to 3.75) | 13/15 | 1.69 (0.77 to 3.72) | 17/12 | 3.50 (1.59 to 7.70)* | 0.001 |
| 6111: field crop and vegetable growers | 11/8 | 2.93 (1.10 to 7.77)* | 5/3 | 3.67 (0.82 to 16.38) | 3/3 | 2.38 (0.40 to 14.2) | 2/1 | 3.46 (0.30 to 40.30) | 0.063 |
| 61112: market gardener and related worker | 8/4 | 3.98 (1.14 to 13.88)* | 4/2 | 4.15 (0.71 to 24.33) | 2/1 | 4.20 (0.35 to 49.75) | 1/0 | – | 0.042 |
| 6112: fruit growers | 23/24 | 2.03 (1.09 to 3.78)* | 3/7 | 0.77 (0.18 to 3.22) | 4/4 | 2.01 (0.47 to 8.61) | 10/7 | 3.51 (1.26 to 9.78)* | 0.014 |
| 61121: fruit grower and worker | 20/21 | 2.07 (1.07 to 4.02)* | 2/7 | 0.49 (0.09 to 2.58) | 2/2 | 2.33 (0.30 to 17.94) | 10/6 | 4.21 (1.43 to 12.35)* | 0.012 |
| 6113: gardeners and nursery growers | 20/19 | 1.96 (1.01 to 3.82)* | 4/5 | 1.14 (0.29 to 4.42) | 7/9 | 1.32 (0.47 to 3.69) | 7/4 | 4.56 (1.28 to 16.28)* | 0.030 |
| 61133: grounds or green keeper | 12/7 | 3.01 (1.14 to 7.96)* | 4/3 | 1.92 (0.41 to 8.97) | 5/1 | 8.21 (0.91 to 73.71) | 2/2 | 2.54 (0.34 to 18.88) | 0.034 |
| 6125: crop and livestock producers | 14/10 | 3.61 (1.44 to 9.02)* | 0/4 | – | 3/1 | 8.14 (0.43 to 155.80) | 6/1 | 12.50 (1.45 to 107.86)* | 0.009 |
| 614: fishery workers, hunters and trappers | 7/3 | 5.62 (1.27 to 24.97)* | 2/0 | – | 3/0 | – | 2/3 | 1.79 (0.26 to 12.20) | 0.077 |
| 7: trades workers | 93/128 | 1.28 (0.89 to 1.83) | 9/12 | 1.37 (0.55 to 3.39) | 18/28 | 1.05 (0.55 to 2.02) | 45/61 | 1.21 (0.77 to 1.92) | 0.411 |
| 71: building trades workers | 57/49 | 2.02 (1.30 to 3.14)* | 8/6 | 2.33 (0.78 to 6.98) | 10/10 | 1.78 (0.71 to 4.47) | 28/28 | 1.61 (0.90 to 2.87) | 0.045 |
| 711: building frame and related trades workers | 33/27 | 1.93 (1.10 to 3.39)* | 3/1 | 4.77 (0.46 to 49.63) | 4/5 | 1.57 (0.40 to 6.15) | 20/18 | 1.66 (0.83 to 3.31) | 0.097 |
| 7112: carpenters and joiners | 32/25 | 1.97 (1.11 to 3.48)* | 3/1 | 4.73 (0.45 to 49.22) | 4/5 | 1.56 (0.40 to 6.13) | 19/17 | 1.59 (0.79 to 3.20) | 0.126 |
| 71122: builder (including contractor) | 23/13 | 2.90 (1.41 to 5.96)* | 1/1 | 2.49 (0.15 to 42.04) | 3/2 | 2.82 (0.44 to 18.06) | 12/10 | 1.82 (0.75 to 4.38) | 0.105 |
| 71311: electrician | 14/6 | 3.61 (1.34 to 9.74)* | 4/1 | 6.64 (0.70 to 62.49) | 2/1 | 2.31 (0.20 to 26.64) | 3/3 | 1.70 (0.33 to 8.79) | 0.197 |
| 8: plant and machine operators and assemblers | 92/120 | 1.42 (1.01 to 2.01)* | 17/21 | 1.37 (0.69 to 2.73) | 32/39 | 1.43 (0.85 to 2.41) | 28/41 | 1.32 (0.76 to 2.27) | 0.133 |
| 9: elementary occupations (including residuals) | 80/111 | 1.44 (1.01 to 2.04)* | 12/24 | 0.85 (0.41 to 1.78) | 32/38 | 1.62 (0.96 to 2.74) | 14/32 | 0.84 (0.43 to 1.65) | 0.561 |
| 9151: labourers | 48/55 | 1.61 (1.03 to 2.52)* | 11/8 | 2.18 (0.84 to 5.70) | 16/24 | 1.10 (0.55 to 2.20) | 8/12 | 1.31 (0.50 to 3.39) | 0.397 |
*P<0.05.
†Only results for all broad occupation categories (all one digit) were included, and for specific occupations (2–5 digits) if the association for ever versus never employed was statistically significant (p<0.05), and based on at least 10 subjects (cases+controls).
‡OR adjusted for age, sex, ethnicity, highest education level, socioeconomic deprivation status and smoking.