Table 1.
Distribution of Explanatory Variables and Associations with Bartonella tribocorum Status Among Norway Rats
|
Bartonella tribocorum status |
Bivariable GLMMa |
|||||
|---|---|---|---|---|---|---|
| Category | Subcategory | Total (%) (n = 370) | Positive (%) (n = 96) | Negative (%) (n = 274) | OR (95% CI) | p |
|
| ||||||
| Season | Fall | 150 (40.5) | 74 (77.1) | 76 (27.7) | Ref | |
| Winter | 77 (20.8) | 5 (6.5) | 72 (26.3) | 0.08 (0.02–0.45) | <0.001 | |
| Spring | 103 (27.8) | 12 (12.5) | 91 (33.2) | 0.09 (0.02–0.38) | <0.01 | |
| Summer | 40 (10.8) | 5 (5.2) | 35 (12.8) | 0.07 (0.01–0.59) | 0.01 | |
| Maturity | Immature | 89 (24.1) | 9 (9.4) | 80 (29.2) | Ref | |
| Mature | 281 (75.9) | 87 (90.6) | 194 (70.8) | 2.45 (1.07–5.64) | 0.03 | |
| Flea presence | No | 159 (43.0) | 35 (36.5) | 124 (45.3) | Ref | |
| Yes | 211 (57.0) | 61 (63.5) | 150 (54.7) | 1.17 (0.65–2.11) | 0.59 | |
| Flea abundance | 0 | 159 (43.0) | 35 (36.5) | 124 (45.3) | Ref | |
| 1–3 | 167 (45.1) | 45 (46.9) | 122 (44.5) | 1.10 (0.60–2.04) | 0.76 | |
| >3 | 44 (11.9) | 16 (16.7) | 28 (10.2) | 1.48 (0.61–3.61) | 0.39 | |
| Flea index | ≤ 0.65 | 151 (40.8) | 53 (55.2) | 98 (35.8) | Ref | |
| 0.65–1.3 | 107 (28.9) | 26 (27.1) | 81 (29.6) | 0.39 (0.05–3.25) | 0.39 | |
| >1.3 | 112 (30.3) | 17 (17.7) | 95 (34.7) | 0.21 (0.03–1.47) | 0.12 | |
a
GLMM controlling for clustering by city block in which the rat was trapped.
CI, confidence interval; GLMM, generalized linear mixed model; OR, odds ratio.