Table 8.

Results from a linear mixed effects model examining factors affecting nest sizes of blue tits (Cyanistes caeruleus) in Wytham Woods, Oxfordshire. This analysis was run on a subset of data of females that bred more than once to investigate any effect their difference in lay date has on their nest size (n = 223); degrees of freedom were calculated from Satterthwaite approximations. This model had an R² of 0.176.

parameter	estimate ± s.e.	d.f.	T-value	p
intercept	3.254 × 10−1 ± 1.762 × 10−2	7.480 × 100	18.467	1.63 × 10−7
change in lay date	−1.731 × 10−4 ± 1.712 × 10−4	2.121 × 102	−1.012	0.313
random effect		Chi d.f.	χ2	p
compartment		1	1.9 × 101	1 × 10−5
year		1	5.68 × 10−14	1.000