Table 4.

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 where nest boxes were used more than once in the study period (n = 444 nests in 201 nest boxes). This model had an R² of 0.388.

	estimate ± s.e.		T-value
intercept	0.331 ± 0.012		27.06
random effect		Chi d.f.	χ2	p
box number		1	11.07	9 × 10−4
compartment		1	14.18	2 × 10−4
year		1	0.79	0.400