Table 3 Model information.

Model	Effect	β	SE	95% CI
(a)—Body condition index of offspring	Intercept	− 28.08	89.90	− 204.41	148.26
	Year	0.05	0.04	− 0.04	0.14
	Laying date	− 0.14	0.03	− 0.20	− 0.09
	No. of hatchlings	− 9.73	2.24	− 14.13	− 5.33
	Female BCI	0.15	0.03	0.10	0.20
	Male BCI	0.22	0.06	0.10	0.33
	Spring prey abundance	4.95	0.73	3.52	6.38
	Precipitation (May–June)	9.94	2.55	4.95	14.94
(b)—Body condition index of male parents	Intercept	242.22	50.68	142.72	341.72
	Year	− 0.07	0.03	− 0.12	− 0.02
	Male age	− 0.14	0.27	− 0.66	0.39
	Spring prey abundance	0.79	0.34	0.12	1.46
	Snow cover (January–March)	0.88	0.34	0.21	1.54
(c)—Body condition index of female parents	Intercept	944.97	89.99	768.42	1121.53
	Year	− 0.40	0.05	− 0.49	− 0.31
	Female age	− 1.06	0.56	− 2.15	0.04
	Autumn prey abundance	− 0.41	0.73	− 1.84	1.03
	Snow cover (January–March)	5.57	0.72	4.17	6.98

Estimate (β), standard error (SE) and 95% confidence interval (CI) of the explanation variables in models with ΔAIC < 2 for the three models (Body condition index of offspring, male and female parents).
Variables with 95% CI that do not cross zero are shown in bold text. The following fixed effects were log-transformed before the analyses: autumn and spring prey abundance, number of hatchlings and each weather variable.

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