Table 2. Statistics for two indices (RP and AD) of the intensity of inbreeding depression in the life-history traits of the population of lines with and without a history of inbreeding.

Trait	Index	Inbreeding history			No inbreeding history			X21	P-value
		Mean	s.e.	n	Mean	s.e.	n
Female maturity rate	RP	−0.027	0.117	34	0.083	0.104	44	0.5	0.47
	AD	−0.053	0.067	30	0.023	0.046	39	1.0	0.31
Male maturity rate	RP	−0.113	0.080	26	0.084	0.091	35	2.4	0.12
	AD	−0.079	0.068	25	0.022	0.078	35	0.8	0.36
Overall maturity rate	RP	−0.163	0.099	34	0.058	0.091	44	2.7	0.10
	AD	−0.087	0.063	32	0.001	0.048	44	1.4	0.23
Juvenile survival	RP	0.072	0.055	37	0.013	0.040	44	0.7	0.41
	AD	0.075	0.052	37	0.014	0.039	44	0.8	0.36
Longevity	RP	−0.008	0.059	16	−0.028	0.046	22	0.1	0.77
	AD	−0.250	2.044	16	−1.091	1.662	22	0.1	0.74
Oviposition rate	RP	0.027	0.022	29	0.114	0.027	33	6.0	0.01
	AD	0.276	0.310	29	1.424	0.348	33	5.8	0.02

Abbreviations: AD, absolute difference; RP, relative performance.

The sample size n refers to the number of independent lines; average values of the indices per line were used in the statistical tests.