title: Pattern of teen menstruation among secondary school girls in south east Nigeria.
abstract: BACKGROUND
  Menstruation in the teenage age has assumed variable trends which is been influenced by several variables. This study is aimed at determining the pattern and trend of menstruation among teens attending secondary school in south east Nigeria and associated factors.
  
  
  METHODS
  Menstruation patterns were investigated using a stratified random sampling method of teens from junior secondary schools in Enugu, south east Nigeria. A self-administered questionnaire was developed and data analyzed using SPSS version 19.
  
  
  RESULTS
  A total of 897 female teenagers aged 9-18 years completed the questionnaire with a mean age of 13.9±1.9 years. The mean age (SD) at onset of menarche was 12.5±1.2 years. Teenage girls with higher BMI achieved menarche earlier at age 8 and 9 when compared with their counterparts with lower BMI and this is statistically significant. F=7.60, df=8, p<0.001. Teens with a 14-day cycle had a higher BMI when compared with teens with longer cycle but this is not statistically significant. F=1.05, df=4, p=0.381. There is a statistical significance difference between teens duration of menstrual flow and BMI. Those with higher BMI had longer duration(4-5 days) compared with those with lower BMI. F=3.329, df=4, p=0.01 CONCLUSIONS: This study revealed that the mean age at onset of menarche was 12.5±1.2 years showing a continuing decreasing trend. Teens with higher BMI attain menarche earlier and had longer days of periods when compared with their counterpart with lower BMI.
authors.forename: Ada R C
authors.initials: AR
authors.lastname: Nwokocha
authors.forename: Josephat M
authors.initials: JM
authors.lastname: Chinawa
authors.forename: Agozie C
authors.initials: AC
authors.lastname: Ubesie
authors.forename: Vivian I
authors.initials: VI
authors.lastname: Onukwuli
authors.forename: Pius C
authors.initials: PC
authors.lastname: Manyike
mesh_terms: D000293:Adolescent; D015992:Body Mass Index; D002648:Child; D005260:Female; D005500:Follow-Up Studies; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D008572:Menarche; D008597:Menstrual Cycle / Q000502:physiology*; D008598:Menstruation / Q000502:physiology*; D008599:Menstruation Disturbances / Q000453:epidemiology* / Q000503:physiopathology*; D009549:Nigeria / Q000453:epidemiology; D015995:Prevalence; D012574:Schools; D011795:Surveys and Questionnaires