Table 2.

Statistical analysis of annual breeding performance and female survival in monogamous, primary and secondary (with and without male assistance) broods. The GLM was performed with Poisson errors for clutch size, number of hatchlings, number of fledglings, number of recruits and number of grandoffspring fledged, and with binomial errors for female survival (i.e. the probability of recapturing in subsequent years). Differences between brood categories were controlled for differences between years as well as laying date (GLM-model: dependent variable=year+laying date+brood category+error).

	clutch size			number of hatchlings			number of fledglings			number of recruits			number of grandoffspring			female survival
	d.f.	χ2	p	d.f.	χ2	p	d.f.	F	p	d.f.	χ2	p	d.f.	F	p	d.f.	χ2	p
year	29	30.63	0.38	29	46.02	0.023	29	9.45	<0.001	27	93.42	<0.001	25	2.77	<0.001	27	46.86	0.010
laying date	1	56.12	<0.001	1	59.83	<0.001	1	344.7	<0.001	1	63.16	<0.001	1	27.64	<0.001	1	14.54	<0.001
brood category	3	1.04	0.79	3	1.32	0.72	3	107.8	<0.001	3	30.02	<0.001	3	4.66	0.003	3	0.49	0.92
mean (±s.e.) estimate of laying date	−0.011(±0.002)	−0.012(±0.002)	−0.081(±0.006)	−0.061(±0.009)	−0.102(±0.025)	−0.031(±0.009)