Table 1.

Correlations of self-report and relatives report of lifetime smoking status for twin, spouse, father, and mother

	Twin	Spouse		Father			Mother
				twin1	twin2	mother	twin1	twin2	father
twin		0.90 (2317)	twin2	0.86 (3894)			0.90 (4009)
spouse	0.91 (2326)		father	0.84 (1363)	0.85 (1321)	0.91 (1189)	0.84 (1342)	0.85 (1303)
			mother	0.85 (1797)	0.84 (1761)		0.87 (1879)	0.90 (1845)	0.90 (1191)

The numbers in parenthesis are the sample size within each category.