The concordance rate for diabetes was substantially higher in monozygous twins (0.73) than in dizygous twins and siblings with CF (0.18.    From Wordnik.com.  [The Journal of Clinical Endocrinology & Metabolism Current Issue] Reference

1366 individuals at 109 centers in the CF Twin and Sibling Study, from which were derived 68 monozygous twin pairs, 23 dizygous twin pairs, and 588 sibling pairs, all with CF.    From Wordnik.com.  [The Journal of Clinical Endocrinology & Metabolism Current Issue] Reference