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Table 3 Associations between farming and GPA

From: Association between environmental exposures and granulomatosis with polyangiitis in Canterbury, New Zealand

  GPA Controls OR (95 % CI) p value
Farm live or work (not visit) at any time prior to index date 22 (44.9 %) 69 (35.2 %) 1.7 (0.8–3.4) 0.16
Farm anya vs. none in the 12 months prior to index date 23 (46.9 %) 58 (29.6 %) 2.7 (1.3–5.8) 0.009
Farm visit vs. everything else (work, live, none) in the 12 months prior to index date 16 (32.7 %) 23 (11.7 %) 7.2 (2.6–19.4) <0.001
Farm live vs. everything else (work, visit, none in the 12 months prior to index date 6 (12.2 %) 24 (12.2 %) 1 (0.3–2.9) 1
Farm work vs. everything else (live, visit, none) in the 12 months prior to index date 1 (2.0 %) 11 (5.6 %) 0.3 (0.03–2.6) 0.26
Crops in the 12 months prior to index date (could include livestock) 18 (36.7 %) 54 (27.6 %) 1.7 (0.8–3.6) 0.16
Livestock in the 12 months prior to index date (could include crops) 29 (59.2 %) 85 (43.4) 2.4 (1.1–5.0) 0.02
Crops and livestock (vs. none or exposure to one) 16 (32.7 %) 53 (27.0 %) 1.4 (0.7–2.97 0.39
Crops and livestock vs. no livestock (i.e. includes crops only and excludes livestock only) 16/36 (44.4 %) 53/164 (32.3 %) 2.20 (0.9–5.5) 0.09
Cows 23 (46.9 %) 73 (37.2 %) 1.6 (0.8–3.3) 0.17
Pigs 13 (26.5 %) 51 (26.0) 1.0 (0.5–2.3) 0.94
Horses 18 (36.7 %) 49 (25.0 %) 1.9 (0.93–.9) 0.08
Sheep 26 (53.1 %) 60 (30.6 %) 3.6 (1.7–7.7) 0.001
Chickens 18 (36.7 %) 51 (26.0 %) 2.0 (0.9–4.4) 0.08
  1. aThis category includes all those who lived, worked or visited a farm in the 12 months prior to the index date. The individual categories live, work or visit were mutually exclusive
  2. CI confidence interval, GPA granulomatosis with polyangiitis, OR odds ratio