title: Age at menarche in Turkish adolescents in Kahramanmaras, Eastern Mediterranean region of Turkey.
abstract: OBJECTIVE
  To determine the age at menarche in adolescents in the Eastern Mediterranean city of Kahramanmaras, Turkey.
  
  
  METHODS
  The study was conducted in primary and high schools of Kahramanmaras, during the academic year 2003-2004. Data of 8212 female students were collected by using a standard questionnaire. Mean and median ages at menarche (with 95% confidence intervals) were calculated by Kaplan-Meier survival analysis. Also, probit analysis was performed to determine the age at menarche for all girls by estimating the age at which 10, 25, 50, 75 and 90% of the girls reached menarche.
  
  
  RESULTS
  According to the answers obtained through the questionnaire, 5506 (67.5%) of 8161 respondents had had their menarche. Mean age at menarche was 13.04 years (95% CI: 13.01-13.06), and median age 13.00 years (95% CI: 12.97-13.03). According to probit analyses, the probability of menstruating before the age of 11.48 years was 10% and before 15.08 years 90%.
  
  
  CONCLUSIONS
  We provide data about age at menarche in Kahramanmaras, an Eastern Mediterranean city of Turkey.
authors.affiliation: Department of Public Health, Kahramanmaraş Sutcu Imam University, Kahramanmaraş, Turkey.
authors.forename: H C
authors.initials: HC
authors.lastname: Ekerbicer
authors.forename: M
authors.initials: M
authors.lastname: Celik
authors.forename: H
authors.initials: H
authors.lastname: Kiran
authors.forename: G
authors.initials: G
authors.lastname: Kiran
mesh_terms: D000293:Adolescent; D000367:Age Factors; D002648:Child; D003431:Cross-Cultural Comparison; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D053208:Kaplan-Meier Estimate; D008572:Menarche / Q000208:ethnology / Q000502:physiology*; D011795:Surveys and Questionnaires; D014421:Turkey