Table 2. Characteristics of persons followed during the entire period of a study of the dose–response relationship between antimicrobial drug use and livestock-associated methicillin-resistant Staphylococcus aureus in pig farming, the Netherlands, 2011–2013*.
| Characteristic | Total study population | Farmers, employees | Partners | Children |
|---|---|---|---|---|
| Age, y (SD) | 33.0 (17.8) | 44.0 (13.6) | 45.2 (8.9) | 14.4 (5.6) |
| Mean time worked, h (SD) | 21.8 (25.2) | 46.0 (19.9) | 10.1 (14.0) | 2.2 (6.6) |
| Total no. |
158 |
66 |
32 |
60 |
| Sex | ||||
| M | 91 | 58 | 0 | 33 |
| F |
67 |
8 |
32 |
27 |
| Open farm | 91 | 34 | 17 | 40 |
| Farrowing† | 26 | 11 | 5 | 10 |
| Farrow-to finish |
65 |
23 |
12 |
30 |
| Closed farm | 67 | 32 | 15 | 20 |
| Farrowing† | 14 | 8 | 3 | 3 |
| Farrow-to finish | 53 | 24 | 12 | 17 |
*Farms were defined as open when they received external supplies of gilts ≥1 time per year from at least 1 supplier and as closed when they received no external supply of gilts. †No fattening pigs present.