Characteristics of the New Zealand phenoxy herbicide producers and sprayers cohort
| Producers | Sprayers | |||
|---|---|---|---|---|
| (1969–2000) | (1973–2000) | |||
| n | % | n | % | |
| *Those classified as exposed to TCDD, higher chlorinated dioxins, and phenoxy herbicides. | ||||
| †Recorded employment for the producers (not counting years after 1984) and reported employment for the sprayers (not counting years after 1980/82). | ||||
| ‡Total number of person-years if all those lost to follow up had been alive and followed to 31 December 2000 | ||||
| §Those classified as not exposed to TCDD, higher chlorinated dioxins, and phenoxy herbicides. The 212 unexposed producers accumulated 4712 person-years. | ||||
| Subjects classified as exposed* | 813 | 699 | ||
| By vital status (at 31 Dec 2000) | ||||
| Alive | 511 | 62.9 | 549 | 78.5 |
| Dead | 122 | 15.0 | 91 | 12.9 |
| Lost to follow up, including emigrated | 180 | 22.1 | 59 | 8.5 |
| By sex | ||||
| Men | 713 | 87.7 | 697 | 99.7 |
| Women | 100 | 12.3 | 2 | 0.3 |
| By duration of recorded employment† | ||||
| <½year | 247 | 30.4 | 4 | 0.6 |
| ½–1 year | 100 | 12.3 | 2 | 0.3 |
| 1–2 years | 131 | 16.1 | 5 | 0.7 |
| 2–6 years | 174 | 21.4 | 92 | 13.2 |
| 6–10 years | 65 | 8.0 | 107 | 15.3 |
| 10–20 years | 73 | 9.0 | 265 | 37.9 |
| >20 years | 23 | 2.8 | 224 | 32.0 |
| Total person-years | 17613 | 20044 | ||
| Total possible person-years‡ | 20185 | 20592 | ||
| Person-years by time since first employment† | ||||
| 0–10 years (person-years) | 7136 | 40.5 | 4170 | 20.8 |
| 10–20 years (person-years) | 6289 | 35.7 | 6032 | 30.1 |
| 20–30 years (person-years) | 3533 | 20.1 | 5691 | 28.4 |
| >30 years (person-years) | 655 | 3.7 | 4151 | 20.7 |
| Subjects classified as unexposed§ | 212 | 4 | ||
| Alive | 118 | 3 | ||
| Dead | 42 | 0 | ||
| Lost to follow up, including emigrated | 52 | 1 | ||