Statistical study on the Kanto Area Incidence of Cleft Lip and/or Palate in 1981 and 1982

• Published in: Journal of Japanese Cleft Palate Association Vol. 9; no. 2; pp. 148 - 158
• Main Authors: YOSHIDA, Hiroshi, OHNO, Kohsuke, MICHI, Ken-ichi, SUZUKI, Noriko, YAMASHITA, Yukari, IMAI, Satoko
• Format: Journal Article
• Language: Japanese
• Published: Japanese Cleft Palate Association 24.12.1984
• Subjects: cleft lip and/or palate; incidence; Kanto area; statistical study
• ISSN: 0386-5185; 2186-5701
• DOI: 10.11224/cleftpalate1976.9.2_148

A survey on cleft lip and/or palate incidence has been conducted on 343 obsterical and gynecological clinics for 1981 and 1982. 1. Incidence: From the 133,042 birth records,217 infants with cleft lip and/or palate were identified. The incidence was 0.163%. 2. The order of cleft frequency was lead by cleft lip and palate followed by cleft lip only and cleft palate only. 3. Sex ratio: All clefts were more frequent in male than in female. 4. Cleft side: Unilateral clefts were significantly predominant over bilateral ones, and left side clefts were significantly more frequent than right side ones. 5. Birth weight and period of gestation: The frequency of births weighted under 2,500 g and preterm delivery in cleft lip and/or palate subjects was significantly higher than that of control subjects. 6. Associated malformations: percentage of associated malformations with cleft including still-birth was 21.3%, and highest in cleft palate alone. Malformations most commonly associated were abnormalities of limbs, micrognathia, heart malformations and anecephalus.