Characteristics of 877 agricultural workers, stratified by farm childhood
| Farm childhood | ||
| No | Yes | |
| Total subjects n | 366 | 511 |
| Males | 269 (73.5) | 455 (89.0) |
| Age yrs | 40.5±10.5 | 46.0±9.6 |
| Smoking habits | ||
| Never | 138 (37.7) | 246 (48.1) |
| Former | 117 (32.0) | 177 (34.7) |
| Current | 111 (30.3) | 88 (17.3) |
| Agricultural sector | ||
| Flower bulb trade | 72 (19.7) | 54 (10.6) |
| Animal feed industry | 82 (22.4) | 32 (6.3) |
| Onion trade (modernised) | 38 (10.4) | 5 (1.0) |
| Onion trade (traditional) | 39 (10.7) | 15 (2.9) |
| Vegetable seed industry | 19 (5.2) | 17 (3.3) |
| Crop farming | 50 (13.7) | 87 (17.0) |
| Dairy farming | 62 (16.9) | 252 (49.3) |
| Pig farming | 4 (1.1) | 49 (9.6) |
| Modelled endotoxin exposure EU·m−3# | 265.0±5.4 | 264.7±3.7 |
Data are presented as n (%) or mean±sd, unless otherwise stated. EU: endotoxin unit. #: geometric mean±geometric sd.