The Company of Biologists

Table 2.

Effect of corticosterone treatment and other parameters on primary, hand and tarsus length, body mass and fat score at day 25 (before fledging) of Eurasian kestrel nestlings

		Primary length			Hand length			Tarsus length			Body mass
Explanatory variable	d.f.	Wald	χ²-P	Wald	χ²-P	Wald	χ²-P	Wald	χ²-P	Wald	χ²-P
Time of day (h)	1	0.36	0.549	1.84	0.175	6.96	0.008	1.77	0.184	4.60	0.032
Sex	1	4.22	0.040	8.04	0.005	0.07	0.784	36.77	<0.001	0.30	0.585
Age difference to oldest nestling (days)	1	35.26	<0.001	0.01	0.930	4.82	0.028	0.02	0.882	3.48	0.062
Brood size	1	2.33	0.127	0.23	0.635	2.65	0.105	0.41	0.524	0.16	0.693
Hatching date (day)	1	0.00	0.997	0.31	0.579	1.86	0.103	4.45	0.035	1.17	0.279
Treatment group	1	98.90	<0.001	21.89	<0.001	39.78	<0.001	37.94	<0.001	0.33	0.568
Sex × treatment group	1	1.62	0.203	1.05	0.305	1.02	0.312	0.03	0.859	0.01	0.939
Age difference to oldest nestling × hatching date	1	4.06	0.044	0.77	0.379	0.13	0.716	2.63	0.105	0.30	0.586
Age difference to oldest nestling × treatment group	1	1.13	0.289	1.17	0.280	0.03	0.857	0.39	0.531	0.48	0.488

		Primary length			Hand length			Tarsus length			Body mass
Explanatory variable	d.f.	Wald	χ²-P	Wald	χ²-P	Wald	χ²-P	Wald	χ²-P	Wald	χ²-P
Time of day (h)	1	0.36	0.549	1.84	0.175	6.96	0.008	1.77	0.184	4.60	0.032
Sex	1	4.22	0.040	8.04	0.005	0.07	0.784	36.77	<0.001	0.30	0.585
Age difference to oldest nestling (days)	1	35.26	<0.001	0.01	0.930	4.82	0.028	0.02	0.882	3.48	0.062
Brood size	1	2.33	0.127	0.23	0.635	2.65	0.105	0.41	0.524	0.16	0.693
Hatching date (day)	1	0.00	0.997	0.31	0.579	1.86	0.103	4.45	0.035	1.17	0.279
Treatment group	1	98.90	<0.001	21.89	<0.001	39.78	<0.001	37.94	<0.001	0.33	0.568
Sex × treatment group	1	1.62	0.203	1.05	0.305	1.02	0.312	0.03	0.859	0.01	0.939
Age difference to oldest nestling × hatching date	1	4.06	0.044	0.77	0.379	0.13	0.716	2.63	0.105	0.30	0.586
Age difference to oldest nestling × treatment group	1	1.13	0.289	1.17	0.280	0.03	0.857	0.39	0.531	0.48	0.488

Data were collected from 109 nestlings in 30 broods. Significant differences are in bold

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