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Table 1 Univariate analysis of risk factors and their association with R. felis seropositivity in dogs at antibody titres ≥64 and ≥128

From: Seroprevalence and risk factors for Rickettsia felis exposure in dogs from Southeast Queensland and the Northern Territory, Australia

Variable surveyed No of sera available Antibody titre ≥64 Antibody titre ≥128  
No of seropositive dogs (%; 95% CI) OR; 95% CI P value No of positive dogs (%) OR; 95% CI P value
Total sera in the study 292 148 (50.7%) 0.45 - 0.56   54 (18.5%) 0.14 - 0.23  
Location     0.360    0.947
SE QLD dogs 185 90 (48.6%) Reference   34 (18.4%) Reference  
NT dogs 107 58 (54.2%) 1.25; 0.78 – 2.01   20 (18.7%) 1.02; 0.55 – 1.88  
Source     0.510    0.221
Client-owned 180 88 (48.9%) Reference   29 (16.1%) Reference  
Pound 100 53 (53.0%; ) 1.18; 0.72 – 1.87   22 (22%) 1.47; 0.79, 2.72  
Status of active ectoparasite control     0.014    0.106
Active ectoparasite control 42 12 (28.6%) Reference   4 (9.5%) Reference  
No active ectoparasite control 106 52 (49.1%) 2.60; 1.20 - 5.56   22 (20.8%) 2.49; 0.80, 7.69  
Breed     0.265    0.286
Purebred 142 67 (47.2%) Reference   23 (16.2%) Reference  
Mixed breed 147 79 (53.7%) 1.30; 0.76 - 2.51   31 (21.1%) 1.38; 0.76, 2.51  
Age     0.298    0.128
Young (<1 year) 58 25 (43.1%) Reference   7 (12.7%) Reference  
Adult (1 – 10 year) 192 101 (52.6%) 1.37; 0.76 – 2.46   41 (21.4%) 1.98; 0.84 – 4.69, 0.121
Geriatric (>10year) 37 18 (48.6) 1.17; 0.51 – 2.67   4 (10.8%) 0.88; 0.24 – 3.25 0.852
Gender     0.638    0.414
Male 143 70 (49.0%) Reference   29 (20.3%) 1.28; 0.71, 2.33  
Female 145 75 (51.7%) 1.12; 0.70 – 1.77   24 (16.6%) Reference  
Desexing status     0.032    0.062
Neutered 111 48 Reference   16 (14.4%) Reference  
Intact 111 64 1.79; 1.05 – 3.04   27 (24.3%) 1.91; 0.96 – 3.78  
  1. CI, confidence interval.
  2. OR, Odds ratio.