Table 3. Generalized linear models of fertility (n = 1007) and potential litter size (n = 993) of adult roe deer females in Slovenia (2013–2015).

The independent variables were age (2–7 years vs. 8+ years), body mass (covariate), body mass × age interaction, and year (2013, 2014 vs. 2015; fixed factor). Model selection was performed using the Akaike information criteria (AIC). For the best model, basic statistics are displayed, while for other models with ΔAIC < 2 only the model structure and ΔAIC are shown.

Fertility (best model) = f (year); AIC = 142.8; p = 0.004
	Estimate	Standard error	Wald value	P value
Year (2013 vs. 2015)	-0.004	0.588	0.001	0.995
Year (2014 vs. 2015)	-1.218	0.457	7.098	0.008
Other models with ΔAIC < 2: none
Potential litter size (best model) = f (age + body mass + age × body mass); AIC = 2646.2; p = 0.012
	Estimate	Standard error	Wald value	P value
Age (2–7 years vs. 8+ years)	-0.095	0.089	1.4	0.262
Body mass	0.020	0.012	2.6	0.089
Body mass × age (2–7 years vs. 8+ years)	0.010	0.016	0.3	0.532
Other models with ΔAIC < 2: f (age + body mass), ΔAIC = 1.1; f (body mass), ΔAIC = 1.9