Table 23.

Results from a linear mixed effects model examining the effect of inter-year variation with forest compartment included as a random effect on nest sizes of blue tits (Cyanistes caeruleus) in Wytham Woods, Oxfordshire (n = 873), p-values were calculated from Wald tests. This model had an R² of 0.060.

parameter	estimate ± s.e.	T-value	p-value
intercept	0.334 ± 0.010	31.888	5.77 × 10−15
year:a
2002	−0.020 ± 0.009	−2.296	0.022
2003	−0.017 ± 0.008	−2.017	0.044
random effect	Chi d.f.	χ2	p-value
compartment	33.7	1	6 × 10−9

^aReference category is: 2001.