Table 3.

Logistic regression model of risk factors for Hendra virus serostatus in LRFF: coefficients, chi-square p-values and odds ratios with 95% CIs for variables included in the model.

variable	category	coefficient estimate	chi-square p-value	odds ratio	95% CI
sex and reproductive status	non-pregnant female	reference
	pregnant female	2.74	<0.001	15.48	4.41–54.35
	lactating female	1.38	0.010	3.96	1.4–11.24
	male	0.02	0.932	1.02	0.61–1.71
age	age 0	19.33	0.972	2×108	0–inf
	3 months (weaning)	2.19	0.060	8.91	0.91–87.17
	6 months	reference
	pre-breeding	1.65	0.120	5.19	0.65–41.38
	mature	2.65	0.011	14.14	1.86–107.75
season	spring 2004	reference
	autumn 2005	−0.70	0.075	0.49	0.23–1.07
	winter 2005	−0.97	0.007	0.38	0.19–0.76
	spring 2005	−1.85	<0.001	0.16	0.07–0.33
	autumn 2006	1.90	<0.001	6.67	2.43–18.31