Outcome of pyometra in female dogs and predictors of peritonitis and prolonged postoperative hospitalization in surgically treated cases

Table 6 Multivariable logistic regression model of association between clinical signs, physical examination findings and laboratory data and the risk of prolonged postoperative hospitalization (≥ 3 days) in bitches with pyometra (n = 184)

Variable^a		Estimated coefficient	Odds Ratio (95% confidence interval)	p-value
Polydipsia^b	Yes	-0.83 (±0.44)	0.43	0.056
Polydipsia^b	Yes	-0.83 (±0.44)	(0.18 - 1.02)	0.056
Vomiting^b	Yes	0.77 (±0.46)	2.16	0.097
Vomiting^b	Yes	0.77 (±0.46)	(0.87 - 5.38)	0.097
Depression	Mild	1.14 (±0.57)	3.14	0.008
Depression	Mild	1.14 (±0.57)	(1.02 - 9.64)	0.008
	Moderate to severe	1.91 (±0.61)	6.78
	Moderate to severe	1.91 (±0.61)	(2.03 - 22.59)
Mucous membranes	Pale	1.13 (±1.37)	3.09	0.021
Mucous membranes	Pale	1.13 (±1.37)	(1.06 - 8.96)	0.021
	Hyperemic	-0.95 (±0.64)	0.39
	Hyperemic	-0.95 (±0.64)	(0.11 - 1.35)
WBC	Leucopenia	1.26 (±1.37)	3.53	0.012
WBC	Leucopenia	1.26 (±1.37)	(0.24 - 51.73)	0.012
	Leucocytosis	-1.31 (±0.49)	0.27
			(0.1 - 0.71)

^aNormal = Within the reference range for healthy bitches and for laboratory variables at the main Clinical chemistry laboratory, University Animal Hospital, Swedish University for Agricultural Sciences, Sweden; WBC = White blood cell count (ref. range 5.8-16 ×10⁹/L); ^bThe variable is not statistically significant (p > 0.05), but included as a confounder in the model.