title: The effect of early menarche on the sexual behaviors of Korean female adolescents.
abstract: OBJECTIVE
  This study examined the relationships between early menarche and sexual behaviors among Korean female adolescents.
  
  
  METHODS
  We analyzed data from the eighth Korea Youth Risk Behavior Web-based survey that was conducted on female high school students in grades 10-12. The survey included 17,867 students, and 974 students were assigned to the early menarche group because they had experienced menarche when they were in grade four or below, and 16,893 students were assigned to the normal menarche group because they had experienced menarche during or after grade five. The characteristics of the sexual behaviors in the early menarche and normal menarche group were analyzed.
  
  
  RESULTS
  The early menarche group was at a higher risk of intersexual kissing or petting (odds ratio [OR], 1.54; 95% confidence interval [CI], 1.28-1.87), intersexual intercourse (OR, 2.35; 95% CI, 1.65-3.36), homosexual kissing or petting (OR, 3.53; 95% CI, 2.22-5.59), homosexual intercourse (OR, 7.70; 95% CI, 4.04-14.66), being the victim (OR, 2.89; 95% CI, 1.98-4.22) or the assailant (OR, 13.55; 95% CI, 6.61-27.78) of sexual assaults, intercourse without any contraception (OR, 1.92; 95% CI, 1.06-3.46), and pregnancy (OR, 5.72; 95% CI, 2.31-14.15) than the normal menarche group.
  
  
  CONCLUSIONS
  Early menarche is associated with risky sexual behaviors among adolescent females; therefore, developing comprehensive sexual health education programs and tools for early intervention are required for children who are expected to experience early menarche.
authors.affiliation: Department of Pediatrics, Dong-A University College of Medicine, Busan, Korea.
authors.forename: Ji In
authors.initials: JI
authors.lastname: Cheong
authors.affiliation: Department of Psychiatry, Dong-A University College of Medicine, Busan, Korea.
authors.forename: Chang Hun
authors.initials: CH
authors.lastname: Lee
authors.affiliation: Department of Psychiatry, Dong-A University College of Medicine, Busan, Korea.
authors.forename: Jae Hong
authors.initials: JH
authors.lastname: Park
authors.affiliation: Department of Occupational and Environmental Medicine, Dong-A University College of Medicine, Busan, Korea.
authors.forename: Byeong Jin
authors.initials: BJ
authors.lastname: Ye
authors.affiliation: Department of Pediatrics, Dong-A University College of Medicine, Busan, Korea.
authors.forename: Kyoung Ah
authors.initials: KA
authors.lastname: Kwon
authors.affiliation: Department of Pediatrics, Dong-A University College of Medicine, Busan, Korea.
authors.forename: Young Seok
authors.initials: YS
authors.lastname: Lee
authors.affiliation: Department of Pediatrics, Dong-A University College of Medicine, Busan, Korea.
authors.forename: Jae Ho
authors.initials: JH
authors.lastname: Yoo
keywords: Menarche; Precocious puberty; Sexual behavior