TABLE 3.

Pearson's correlation coefficients for BMI-z_5to10 and residual phenotypes¹

	MZ twins	DZ twins	Same-sex DZ twins	DZ twins and siblings2
BMI-z5to10	0.80 (65)	0.59 (21)	0.47 (13)	0.31 (148)
BMI-z5to103	0.84 (55)	0.62 (17)	0.35 (9)	0.34 (123)
BMI-zadj	0.81 (63)	0.58 (21)	0.41 (13)	0.27 (127)
BMI-zadjFEV	0.85 (58)	0.66 (21)	0.57 (13)	0.25 (122)

¹All values are Pearson's correlation coefficients; no. of pairs in parentheses. BMI-z_adj, average BMI z score from 5 to 10 y of age adjusted for female sex, birth cohort, pancreatic insufficiency, and history of meconium ileus; BMI-z_adjFEV, average BMI z score from 5 to 10 y of age adjusted as for BMI-z_adj plus for FEVq_6to10; BMI-z_5to10, average BMI z score from 5 to 10 y of age; DZ, dizygous; MZ, monozygous.

²Same-sex DZ twins and siblings with <3 y of difference in age.

³After exclusion of pairs in whom one or both members of the pair had an average height z score from 5 to 10 y of age less than −1.96.