Overall | Self | Proxy | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Controls | Cases | p for trend | Controls | Cases | p for trend | Controls | Cases | p for trend | |||||||
n | OR* | 95% CI | n | OR† | 95% CI | n | OR† | 95% CI | |||||||
*Odds ratio adjusted for age (⩽49, 50–59, 60–69, ⩾70) and respondent type. | |||||||||||||||
†Odds ratio adjusted for age (⩽49, 50–59, 60–69, ⩾70). | |||||||||||||||
‡Reference category: non-farmers. | |||||||||||||||
§Subjects who lived or worked on a farm only before age 18. | |||||||||||||||
¶Subjects who had lived or worked on a farm as an adult (>18 years). | |||||||||||||||
**Numbers may not sum to total adult farmers due to missing information on years farmed and farm size. | |||||||||||||||
Non-farmers | 112 | 49 | 1.0 | Ref‡ | 40 | 20 | 1.0 | Ref‡ | 72 | 29 | 1.0 | Ref‡ | |||
Farmers | |||||||||||||||
Only before age 18§ | 49 | 27 | 1.3 | 0.7–2.4 | 27 | 5 | 0.4 | 0.1–1.2 | 22 | 22 | 2.5 | 1.2–5.3 | |||
Adult farmers¶ | 122 | 62 | 1.7 | 1.0–2.9 | 35 | 12 | 0.7 | 0.3–1.8 | 87 | 50 | 2.6 | 1.4–4.9 | |||
Adult farmers** | |||||||||||||||
Years farmed | |||||||||||||||
⩽24 | 29 | 12 | 1.2 | 0.5–2.7 | 9 | 2 | 0.3 | 0.1–1.8 | 20 | 10 | 2.1 | 0.8–5.8 | |||
25–54 | 34 | 18 | 1.6 | 0.8–3.3 | 11 | 6 | 1.0 | 0.3–3.4 | 23 | 12 | 2.2 | 0.9–5.5 | |||
⩾55 | 40 | 24 | 3.9 | 1.8–8.6 | 0.001 | 9 | 3 | 1.4 | 0.2–7.9 | 0.885 | 31 | 21 | 6.2 | 2.3–16.2 | <0.001 |
Average acres | |||||||||||||||
<160 | 38 | 17 | 1.7 | 0.8–3.7 | 10 | 3 | 0.8 | 0.2–3.4 | 28 | 14 | 2.6 | 1.0–6.4 | |||
160–320 | 31 | 26 | 3.3 | 1.6–6.8 | 4 | 2 | 0.9 | 0.2–5.9 | 27 | 24 | 4.6 | 2.0–10.6 | |||
>320 | 35 | 14 | 1.3 | 0.6–2.7 | 0.061 | 19 | 7 | 0.7 | 0.2–2.2 | 0.588 | 16 | 7 | 1.9 | 0.7–5.8 | 0.006 |