General intellectual capacity of young men with cleft lip with or without cleft palate and cleft palate alone.

We report on the general intellectual capacity of men around 17-19 years of age and with cleft lip either with or without cleft palate (CLP) or cleft palate alone. Data were obtained from the Swedish National Service enrolment register for the years 1991-1997, about 335 individuals with CLP and 88 with cleft palate alone, who were compared with a control group consisting of 272 879 people. Those with CLP showed no significant differences compared with the control group. The group with cleft palate alone had significantly lower general intellectual scores than the control group.