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Table 2 Results of the final multivariable Cox proportional hazards regression model for “first” T. canis infection

From: Recurrent patent infections with Toxocara canis in household dogs older than six months: a prospective study

  No. of dogs No. of dog-months at risk No. of observed FPIs HR 95 % CI P-value
Age group
 0–12 months 202 636 42 Ref.    
 1–7 years 575 5,678 157 0.47 0.32 0.67 < 0.0001
  > 7 years 250 2,469 60 0.40 0.26 0.61 < 0.0001
Sex
 Male 362 3,702 113 Ref.    
 Female 481 5,081 146 0.93 0.72 1.20 0.580
Coprophagy
 No 475 4,877 115 Ref.    
 Yes 400 3,906 144 1.36 1.05 1.77 0.021
Sampling season
 Summer 655 2,332 38 Ref.    
 Winter 741 2,434 89 1.73 1.14 2.61 0.009
 Autumn 564 1,978 76 1.62 1.05 2.50 0.030
 Spring 603 2,039 56 1.28 0.81 2.01 0.287
Eating soil/sand
 No 740 7,818 213 Ref.    
 Yes 106 965 46 1.62 1.12 2.35 0.011
Following a commercial diet
 No 320 3,081 68 Ref.    
 Yes 567 5,702 191 1.47 1.08 2.00 0.014
Following a diet containing frozen raw meat
 No 381 3,377 131 Ref.    
 Yes 494 5,406 128 0.68 0.52 0.89 0.005
Having respiratory conditions
 No 822 8,456 244 Ref.    
 Yes 46 327 15 1.84 1.08 3.13 0.026
Having neurologic conditions
 No 819 8,413 257 Ref.    
 Yes 40 370 2 0.21 0.06 0.82 0.024
Having urologic conditions
 No 816 8,467 245 Ref.    
 Yes 41 316 14 1.79 1.12 2.86 0.015
Excreting worms in faeces
 No 828 8,688 252 Ref.    
 Yes 10 95 6 2.26 1.16 4.42 0.017
Off-leash walking time (%)
  ≤ 20 131 1,325 29 Ref.    
 20–50 260 2,461 54 1.06 0.64 1.75 0.829
 50–80 141 1,337 40 1.30 0.76 2.23 0.341
  > 80 375 3,660 136 1.79 1.13 2.83 0.013
Time since last deworming (months)a 1.002 1.000 1.003 0.024
  1. aContinuously time-varying variable let interact with the underlying time variable
  2. Abbreviations: HR hazard ratio; 95 % CI, 95 % confidence interval; FPI “first” patent infection; Ref. reference category