Table 2.

Relationship between midpiece length and flagellum length: correlation coefficient r and slope b obtained from the GLS regression was used to calculate the RMA regression slope v. (Standard errors (s.e.) for b were used to compare v against 1 and t and p are given from a one sample t-test of the slope against 1. The data of the monogamous Sylviidae are a subset of the data of Sylviidae.)

family	b	v	s.e.	r	n	t	p
all species	1.48	1.76	0.11	0.99	73	6.91	<0.005
Fringillidae	1.13	1.14	0.03	0.99	16	4.67	<0.005
Sylviidae	1.03	1.11	0.06	0.93	22	1.83	<0.05
monogamous Sylviidae	1.23	1.26	0.11	0.97	7	2.36	<0.05
Alaudidae	1.18	1.19	0.02	0.99	10	9.50	<0.005
Turdidae	1.29	1.30	0.05	0.99	8	6.00	<0.005