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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
Fat score
Explanatory variabled.f.Waldχ2-PWaldχ2-PWaldχ2-PWaldχ2-PWaldχ2-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 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 1.62 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 1.13 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
Fat score
Explanatory variabled.f.Waldχ2-PWaldχ2-PWaldχ2-PWaldχ2-PWaldχ2-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 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 1.62 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 1.13 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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