All heritability estimates are statistically significant (p < 0.0005) and have a standard error of less than 0.023 (except for prostate-specific antigen [PSA], which was measured only in 2,604 males, and for which the standard error was 0.039, and thyroid stimulating hormone [TSH], which was measured in 3,461 individuals, and for which the standard error was 0.032).