摘要
All of 1055 cleft-lip and/or cleft-palate cases with their 1055 families were investigated. As the results." the incidence of siblings of propositi is 2.2% (39/1791). The incidences of the first, second and third degree relatives were 1.53% (60/3927), 0.22% (25/11359), 0.30% (31/10296) respectively. In 17 cases, either of propositi’s parents had cleft, the incidence of cleft among propositi’s siblings was 9.52% (2/21). In 34 cases, the incidence of rest propositi’s siblings beyond those whose one sib had cleft or more is 5% (4/80), whereas both their parents were normal. Based on above, all incidences of different order relatives were higher than population ones. Furthermore, it is demonstrable that the closer the consanguinity is, the higher the incidence is, and if there was cleft in one family, the incidence increased obviously among his siblings or children, revealing apparent family tendency. In this group, the heritability is 46.80%.
All of 1055 cleft-lip and/or cleft-palate cases with their 1055 families were investigated. As the results.' the incidence of siblings of propositi is 2.2% (39/1791). The incidences of the first, second and third degree relatives were 1.53% (60/3927), 0.22% (25/11359), 0.30% (31/10296) respectively. In 17 cases, either of propositi's parents had cleft, the incidence of cleft among propositi's siblings was 9.52% (2/21). In 34 cases, the incidence of rest propositi's siblings beyond those whose one sib had cleft or more is 5% (4/80), whereas both their parents were normal. Based on above, all incidences of different order relatives were higher than population ones. Furthermore, it is demonstrable that the closer the consanguinity is, the higher the incidence is, and if there was cleft in one family, the incidence increased obviously among his siblings or children, revealing apparent family tendency. In this group, the heritability is 46.80%.
