Table 2.

Univariate analysis of risk factors for Hendra virus serostatus in LRFF: proportion seropositive, odds ratios with 95% CIs and chi-square p-values for variables included in the analysis.

variable	category	proportion seropositive	odds ratio	95% CI	chi-square p-value
sex and reproductive status	non-pregnant female	0.16	1.00
	pregnant female	0.83	25.47	9.23–70.22	<0.001
	lactating female	0.52	5.6	2.24–14.01	<0.001
	male	0.23	1.55	1.02–2.38	0.041
age	0–1 month	1.00	3×108	0–inf	0.971
	3 months	0.14	9.47	1.1–81.79	0.041
	6 months	0.02	1.00
	pre-breeding	0.12	8.46	1.12–64.17	0.039
	adult	0.35	32.62	4.46–238.54	<0.001
season	spring 2004	0.31	1.00
	autumn 2005	0.47	1.66	0.97–2.83	0.066
	winter 2005	0.16	0.41	0.24–0.71	0.002
	spring 2005	0.06	0.14	0.07–0.28	<0.001
	autumn 2006	0.76	6.99	2.63–18.62	<0.001
forearm	forearm length (mm)		1.09	1.06–1.12	<0.001
weight	body weight (g)		1.01	1.00–1.01	<0.001
weight/forearm ratioa	body weight (g)/forearm length (mm)		1.75	0.80–3.83	0.163

^aExcluding pregnant females.