Table 2 Adjusted prevalence ratios and corresponding 95% confidence intervals of the association between the presence of antibodies against C. burnetii, and characteristics/exposures, the Netherlands, March 2014–February 2015
Participants (%) (n = 2296) | Prevalence ratio (95% CI)a | p-value | |
|---|---|---|---|
Age | |||
< 40 years old | 177 (7.7) | Reference | |
40–60 years old | 1045 (45.5) | 1.0 (0.5–1.8) | 0.93 |
> 60 years old | 1074 (46.8) | 1.1 (0.7–1.7) | 0.77 |
Ever smoked | 1262 (55.1) | 0.8 (0.6–1.0) | 0.09 |
Female gender | 1240 (54.0) | 0.8 (0.6–0.9) | 0.01 |
Educational level | |||
Low | 592 (25.8) | Reference | |
Middle | 1027 (44.7) | 0.8 (0.6–1.0) | 0.03 |
High | 677 (29.5) | 0.7 (0.4–1.0) | 0.06 |
Animal farms | |||
Presence of Q fever affected goat farmb | |||
within > 2000 m | 2038 (88.8) | Reference | |
within 1500–2000 m | 139 (6.1) | 1.2 (0.6–2.5) | 0.53 |
within 1000–1500 m | 91 (4.0) | 2.2 (1.1–4.3) | 0.02 |
within 500–1000 m | 24 (1.1) | 4.5 (2.6–7.7) | < 0.01 |
within < 500 m | 4 (0.2) | 9.5 (2.8–31.6) | < 0.01 |
Presence of goat farm (yes/no) | |||
within 1000 mb | 159 (6.9) | 3.0 (1.4–6.4) | < 0.01 |
within 500 mc | 40 (1.7) | 2.0 (0.7–5.7) | 0.19 |
Presence of sheep farm (yes/no) | |||
within 1000 mb | 391 (17.0) | 1.4 (0.7–2.8) | 0.28 |
within 500 mc | 120 (5.2) | 1.2 (0.5–3.2) | 0.69 |
Presence of cattle farm (yes/no) | |||
within 1000 mb | 2154 (93.8) | 1.2 (0.5–3.3) | 0.69 |
within 500 mc | 1130 (49.2) | 1.1 (0.9–1.4) | 0.18 |
Farm animalsd | |||
> 50 goats within 1000 m | 249 (10.8) | 1.9 (1.2–3.0) | < 0.01 |
> 50 sheep within 1000 m | 619 (27.0) | 1.2 (0.7–2.0) | 0.43 |
Number of cattle within 1000 m (tertiles) | |||
≤ 314 | 752 (32.8) | Reference | |
315–834 | 766 (33.4) | 1.0 (0.6–1.6) | 1.00 |
≥ 835 | 778 (33.9) | 1.0 (0.7–1.5) | 0.85 |