T he degree of assortative mating for psychological and physical traits in Asian societies is relatively unknown. The present study examined assortative mating for educational level, personality traits, religious affiliation, height, weight, and body mass index in a Korean sample. Age-adjusted spouse correlations were high for educational level (r = .63) and religious affiliation (r = .67), modest for most personality traits ( r s = -.01 to .26), and trivial for height (r = .04), weight (r = .05), and body mass index (r = .11). These results were remarkably similar to those found from the western samples. Implications of the present findings in behavior genetic studies and human mating patterns were briefly discussed.Assortative mating is the tendency for spouses to resemble each other more than expected by chance. Assortative mating can affect the genetic structure of a population by increasing genetic variance and covariance (Cavalli-Sforza & Bodmer, 1971;Crow & Felsenstein, 1982) and natural selection (Eckland, 1982). Behavior geneticists have long been interested in assortative mating because it influences heritability estimates in twin and family studies by increasing genetic resemblance between first-degree relatives. Assortative mating has been documented for a variety of variables. In general, age, race, religion, and ethnic background show the strongest assortment. These are followed by education (spouse r = 0.50-0.65) and attitudes (spouse r = 0.50-.60) and then by mental abilities (spouse r = 0.30-0.40), socioeconomic status (spouse r = 0.30), height, weight, and body mass index (spouse r = 0-0.30), and personality traits (spouse r = 0-0.25). Reviews of studies of assortative mating can be found in Vandenberg (1972), Jensen (1978), Spuhler (1982, Grilo andPogue-Geile (1991), andHur (2001).The vast majority of studies of assortative mating have been conducted using couples from western societies and, therefore, the degree of assortment in non-western cultures is relatively unknown. The purpose of the present study is to examine degrees of assortative mating in Korean couples on personality traits, educational level, religious affiliation, height, weight, and body mass index (BMI). In Asian societies arranged marriages are still common, which may cause degrees of spouse resemblance in Asian societies to be different from those found in the western world. Because the number of twin and family studies using Asian populations is increasing, the present data provide important information for understanding genetic and environmental influences on psychological and physical traits estimated from Asian populations.
Method
SampleThe sample consists of parents of the elementary school twins who participated in the Seoul Twin Family Study (STFS). The STFS is a large, longitudinal twin family study of genetic and environmental influences on the development of cognitive abilities and other psychological traits in children and adolescents in Seoul, Korea. Twins and their parents in the STFS were ascertained systemati...