Table 9.

Results from a linear mixed effects model examining differences in the nine ‘compartments’ or geographical areas at Wytham Woods, Oxfordshire, UK and differences among the 3 years in nest sizes of blue tits (Cyanistes caeruleus) (n = 803 nests); degrees of freedom were calculated from Satterthwaite approximations; p-values were calculated from Wald tests. This model had an R² of 0.057.

parameter	estimate ± s.e.	T-value	p
intercept	0.318 ± 0.010	30.985	<2 × 10−16
	compartment:a
C	0.056 ± 0.013	4.447	9.97 × 10−6
CP	−0.015 ± 0.020	−0.746	0.456
E	−0.006 ± 0.012	−0.508	0.612
MP	0.006 ± 0.014	0.414	0.679
O	0.0507 ± 0.012	4.143	3.79 × 10−5
P	0.019 ± 0.026	0.752	0.452
SW	−0.001 ± 0.014	−0.62	0.950
W	0.034 ± 0.013	2.654	0.008
year:b
2002	−0.019 ± 0.009	−2.222	0.027
2003	−0.008 ± 0.008	−0.916	0.360

^aReference category is B.

^bReference category is 2001.