Table 2.

Logistic regression identifying predictors for the presence of damage to the skull caused by the cranial helminths Troglotrema acutum and Skrjabingylus nasicola in European polecats. Results are presented for the most parsimonious model identified after model selection. In the initial model, we included sex, age (in months), abundance of T. acutum, abundance of S. nasicola and month of sampling as fixed factors. We only included two-way interactions.

Fixed effects	Estimate	s.e.	z value	p value
(Intercept)	−2.848	0.336	−8.483	<0.001
T. acutum abundance	0.032	0.006	5.523	<0.001
S. nasicola abundance	0.254	0.039	6.490	<0.001
Sex–Male	0.461	0.387	1.190	0.234
S. nasicola abundance* Sex–Male	−0.151	0.042	−3.625	<0.001
marginal R2: 0.516
Dispersion ratio: 1.927