Table 2.

Estimates and standard errors of sib-sib correlation in 2,500 families with three siblings

Familial correlation	Ascertainment	Cut-off %	Estimated sib-sib correlation	Standard error
Strong	none		0.3271	0.0074
	SM	70	–0.0442	0.0110
		90	–0.1633	0.0090
	SS	70	0.0322	0.0119
		90	–0.0886	0.0103
Weak	none		0.1486	0.0074
	SM	70	–0.1800	0.0087
		90	–0.2529	0.0071
	SS	70	–0.0864	0.0104
		90	–0.1928	0.0085