Michael T. French, a sociology professor at the University of Miami, and his team looked at longitudinal data of more than 9,000 adolescents as they became young adults—starting in 1994 when participants were in high school and middle school and ending in 2009 when they were aged 24 to 34. Interviewers were asked to rate the participants’ looks, personality, and grooming on a scale of one to five, five being the most attractive.
Of those three traits, the only statistically significant interaction was that men with an above average attractive personality were more likely to get married. Taking each of the factors individually, no other significant trends emerged. But those three factors in aggregate (what the researchers called “the personal traits index”) were linked to likelihood of marriage. Someone who scored more highly on the index overall was more likely to walk down the aisle. [link]