All participants had genomic or phenotypic data from at least one parent. A total of 912 participants had no genomic or phenotypic data from their father, and 209 participants were missing genomic and phenotypic data from their mother. Those missing father data were slightly older (t = −2.27, df = 4087, p = .02) and reported lower educational attainment (t = 9.10, df = 4087, p < .001) than individuals who had father genotypic or phenotypic data. Those missing mother data also reported lower educational attainment (t = 2.33, df = 4087, p = .02) than individuals who had mother genotypic or phenotypic data.
