Table 2.

Models describing the effect of dietary antioxidants (diet[A] = anthocyanin versus controls, reference group) on circulating levels of corticosterone in relation to the time spent flying and flight muscle mass score and during autumn (season[autumn]) and spring (reference group) (only time point ‘after flight’ was considered).

variable (n/ R2Adj)	fixed effect				random effects
	estimate (s.e.)	d.f.	F	p	factor	% of total variance	var. comp.
cort (45/0.37)
flight duration	0.05 (0.17)	36.30	0.08	0.77	assay	26.88	0.33 [−0.25,0.91]
diet[A]	−0.39 (0.15)	37.04	6.85	0.013	residual	73.12	0.90 [0.59,1.53]
flight duration*diet[A]	−0.36 (0.18)	37.96	4.19	0.045
season[autumn]	0.02 (0.23)	23.99	0.0004	0.95
cort (45/0.23)
muscle mass	0.36 (0.15)	40	5.89	0.02
diet[A]	−0.38 (0.16)	40	5.83	0.02
muscle mass*diet[A]	−0.06 (0.15)	40	0.15	0.70
season[autumn]	−0.05 (0.17)	40	0.10	0.70