Table 4.
Risk of mantle cell lymphoma associated with a history of farming and selected occupations*
| Controls, No. (%)† | Cases, No. (%)† | OR (95% CI) | P | |
|---|---|---|---|---|
| Farming | ||||
| Ever lived or worked on a farm‡ | ||||
| No | 6488 (65.0) | 211 (61.3) | 1.00 (referent) | .254 |
| Yes | 3232 (32.4) | 120 (34.9) | 1.17 (0.90 to 1.53) | |
| Ever lived on a farm‡ | ||||
| No | 3230 (53.1) | 99 (46.3) | 1.00 (referent) | .031 |
| Yes | 2617 (43.0) | 102 (47.7) | 1.40 (1.03 to 1.90) | |
| Ever worked on a farm‡ | ||||
| No | 7791 (84.1) | 260 (79.3) | 1.00 (referent) | .334 |
| Yes | 1272 (13.7) | 57 (17.4) | 1.17 (0.85 to 1.61) | |
| Ever worked in animal farming | ||||
| No | 7946 (97.3) | 279 (97.6) | 1.00 (referent) | .683 |
| Yes | 204 (2.5) | 7 (2.4) | 0.85 (0.39 to 1.86) | |
| Ever worked in crop farming | ||||
| No | 7857 (96.2) | 276 (96.5) | 1.00 (referent) | .695 |
| Yes | 293 (3.6) | 10 (3.5) | 0.87 (0.44 to 1.73) | |
| Ever worked in field crop and vegetable farming | ||||
| No | 6639 (97.8) | 219 (99.5) | 1.00 (referent) | .062 |
| Yes | 122 (1.8) | 1 (0.5) | 0.23 (0.03 to 1.69) | |
| Ever worked in mixed and unspecified farming | ||||
| No | 7135 (93.5) | 245 (90.7) | 1.00 (referent) | .457 |
| Yes | 482 (6.3) | 25 (9.3) | 1.19 (0.76 to 1.84) | |
| Other occupations | ||||
| Cleaners | ||||
| No | 7746 (94.9) | 269 (94.1) | 1.00 (referent) | .088 |
| Yes | 404 (4.9) | 17 (5.9) | 1.61 (0.96 to 2.69) | |
| Drivers | ||||
| No | 7538 (92.3) | 248 (86.7) | 1.00 (referent) | .086 |
| Yes | 612 (7.5) | 38 (13.3) | 1.40 (0.97 to 2.03) | |
| Drivers: material-handling equipment operators | ||||
| No | 8069 (98.8) | 277 (96.9) | 1.00 (referent) | .008 |
| Yes | 70 (0.9) | 9 (3.1) | 3.05 (1.47 to 6.31) | |
| Electrical and electronics workers | ||||
| No | 7690 (94.2) | 256 (89.5) | 1.00 (referent) | .023 |
| Yes | 460 (5.6) | 30 (10.5) | 1.63 (1.09 to 2.44) | |
| Woodworkers | ||||
| No | 7909 (96.9) | 271 (94.8) | 1.00 (referent) | .240 |
| Yes | 241 (3.0) | 15 (5.2) | 1.41 (0.81 to 2.43) | |
| Welders and flamecutters | ||||
| No | 8017 (98.2) | 280 (97.9) | 1.00 (referent) | .898 |
| Yes | 133 (1.6) | 6 (2.1) | 1.06 (0.46 to 2.44) | |
| Textile worker | ||||
| No | 7724 (94.6) | 275 (96.2) | 1.00 (referent) | .953 |
| Yes | 426 (5.2) | 11 (3.8) | 1.02 (0.54 to 1.91) | |
| Painter | ||||
| No | 8015 (98.2) | 278 (97.2) | 1.00 (referent) | .396 |
| Yes | 135 (1.7) | 8 (2.8) | 1.39 (0.67 to 2.91) | |
| Metal worker | ||||
| No | 7693 (94.2) | 267 (93.4) | 1.00 (referent) | .709 |
| Yes | 457 (5.6) | 19 (6.6) | 0.91 (0.55 to 1.50) | |
* Odds ratio (OR) and 95% confidence interval (95% CI) adjusted for age, sex, race, and study.
† The counts do not add up to the total number of cases and controls due to data missing by design or report.
‡ Indicates self-reported history of living and/or working on a farm, based on specific questions during interview. All other occupational data were ascertained through detailed occupational histories, coded according to the International Standard Classification of Occupations (ISCO), Revised Edition 1968.