Table 2.

Results of a GLMM of the association between the number of juveniles and the estimated sex ratio (proportion of males) and predicted abundance of breeding birds on Constant Effort Sites between 1994 and 2012. Site and year were included as a random effect to control for the non‐independence of counts from sites and years. DFs calculated using the Satterthwaite formula

Fixed effects	Estimate (SE)	z‐value	P‐value
Intercept	2·75 (0·29)	9·45	<0·001
Sex ratio (proportion of males)	−0·39 (0·21)	−1·89	0·05
Sex ratio (proportion of males)2	−0·48 (0·21)	−2·29	0·02
Abundance	0·72 (0·21)	3·51	<0·001

Random effects	Variance (SD)
Site	0·25 (0·50)
Year	0·08 (0·30)