Skip to main content

Table 3 Adjusted hazard ratios for herd-level PCVAD status based on classification of easting into four zones§.

From: Spread of porcine circovirus associated disease (PCVAD) in Ontario (Canada) swine herds: Part I. Exploratory spatial analysis

Variable Estimate (HR) 95% CI P
<500 km East (zone 1) referent - - -
500 to <600 km East (zone 2) 1.58 1.16, 2.15 0.003
600 to <700 km East (zone 3) 0.77 0.19, 3.21 0.724
>700 km East (zone 4) 4.29 1.51, 12.18 0.006
PRRSv status (positive) 1.58 0.92, 2.73 0.097
LR χ2 = 15.68, df = 4, n = 278, P = 0.0035, AIC = 1732.9
No GOF test could be produced for the model with categorical data
Global test of proportional hazard assumption (χ2 = 1.69, df = 4, P = 0.79)
  1. §The table corresponds to survival curves in Figure 5