Table 2.

Results of the Generalized Linear Models (logit link, binomial distribution) explaining the proportion of feeding visits by the male (number of visits by male/total number of feeding visits by the pair)

	DF	χ2	P
Reduced model
Male age	1, 48	10.88	0.001
Removed variables
Androgens foster eggs (PC1)	1, 47	0.02	0.89
Androgens original eggs (PC1)	1, 47	0.18	0.69
Foster*original egg androgens	1, 45	0.03	0.87
Male age*androgens foster eggs	1, 46	1.19	0.28
Male age*androgens original eggs	1, 46	0.11	0.73
Female age	1, 47	1.88	0.17
Laying date	1, 47	0.70	0.40

DF degrees of freedom; χ² chi-square statistic