title: Female predominance in intermittent exotropia.
abstract: OBJECTIVE
  To evaluate gender differences among children diagnosed with intermittent exotropia.
  
  
  METHODS
  Retrospective, population-based cohort study.
  
  
  METHODS
  The medical records of all Olmsted County, Minnesota residents younger than 19 years diagnosed with intermittent exotropia from January 1, 1975, through December 31, 1994, were reviewed.
  
  
  RESULTS
  One hundred eighteen (64.1%) of the 184 study patients were girls with an age-adjusted incidence rate of 38.3 (95% CI: 31.4-45.2) per 100,000 compared to 20.8 (95% CI: 15.7-25.8) per 100,000 for boys (P < .0001). There were no significant differences between girls and boys in their family history of strabismus, birth weight, prevalence of prematurity, age at diagnosis and surgery, refractive error, and initial angle of deviation.
  
  
  CONCLUSIONS
  Intermittent exotropia was nearly twice as common in girls compared with boys in this defined population. There were, however, no significant historical or clinical differences between the genders.
authors.affiliation: Department of Ophthalmology, Mayo Clinic and Mayo Foundation, 200 First Street SW, Rochester, MN 55905, USA.
authors.forename: Kevin J
authors.initials: KJ
authors.lastname: Nusz
authors.forename: Brian G
authors.initials: BG
authors.lastname: Mohney
authors.forename: Nancy N
authors.initials: NN
authors.lastname: Diehl
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D015331:Cohort Studies; D005099:Exotropia / Q000453:epidemiology*; D005260:Female; D006801:Humans; D015994:Incidence; D007223:Infant; D008297:Male; D008910:Minnesota / Q000453:epidemiology; D015995:Prevalence; D012189:Retrospective Studies; D017678:Sex Distribution; D012737:Sex Factors