Table 3 Correlations for educational attainment between different types of family members.

From: Conventional twin studies overestimate the environmental differences between families relevant to educational attainment

Dyads

r (95% CIs)

Number of pairs

MZ twins

0.769 (0.73–0.803)

498

DZ twins

0.595 (0.531–0.652)

439

Sibling and random twin

0.453 (0.339–0.554)

212

Mother and random twin

0.406 (0.35–0.46)

884

Mother and sibling

0.497 (0.385–0.594)

201

Father and random twin

0.418 (0.345–0.486)

525

Father and sibling

0.388 (0.232–0.524)

132

Parents

0.597 (0.536–0.651)

482

  1. r = Pearson correlation, CIs Confidence Intervals. The p value was <0.001 for all correlations.
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