Table 5.

Logistic regression of the effect of time, sterilisation rate and proportion of spays on lactating females. Significance levels: “*” <0.05, “**” <0.001, “***” <0.0001.

Predictor Variables	Odds Ratio (Lactating vs. Non-Lactating Female)	95% CI	p Value	Significance
Years since baseline	0.38	(0.27–0.54)	<0.0001	***
Sterilisation rate	8613	(6.30 × 10−7–1.18 × 1014)	0.447
Proportion of spays	0.77	(0.62–0.96)	0.018	*
years since baseline × sterilisation rate	0.12	(4.65 × 10−4–29.06)	0.445
Years since baseline × proportion of spays	1.26	(1.02–1.55)	0.028	*
Sterilisation rate × proportion of spays	1.02 × 1013	(1071–9.73 × 10−22)	0.0106	*
Years since baseline × sterilisation rate × proportion of spays	0.00062	(3.96 × 10−6–0.096)	0.0041	**