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Sample size and intra-class correlations of gestational age for three classes of sibling relationships
| Class | Number of fathers | Number of mothers | Number of offspring | ICC | 95% CI |
|---|---|---|---|---|---|
| Full-sibs | 433,150 | 433,150 | 1,279,321 | 0.2467 | 0.2436 – 0.2498 |
| Paternal half-sibs | 43,563 | 90,509 | 151,047 | 0.0333 | 0.0274 – 0.0392 |
| Maternal half-sibs | 99,635 | 47,854 | 144,527 | 0.1855 | 0.1776 – 0.1936 |
ICC: Intra-class correlation. CI: Confidence interval.
