The average IQ score difference between siblings is 13 points, not that far off the average difference of 17 points for pairs of individuals selected at random from the population.
— Blueprint by Robert Plomin
Quote Last Modifed: 3/15/2020 6:42:36 PM
Database Dated : 3/28/2026 4:50:06 PM
Database Dated : 3/28/2026 4:50:06 PM