title: Sexual function in men older than 50 years of age: results from the health professionals follow-up study.
abstract: BACKGROUND
  Although many studies have provided data on erectile dysfunction in specific settings, few studies have been large enough to precisely examine age-specific prevalence and correlates.
  
  
  OBJECTIVE
  To describe the association between age and several aspects of sexual functioning in men older than 50 years of age.
  
  
  METHODS
  Cross-sectional analysis of data from a prospective cohort study.
  
  
  METHODS
  U.S. health professionals.
  
  
  METHODS
  31 742 men, age 53 to 90 years.
  
  
  METHODS
  Questionnaires mailed in 2000 asked about sexual function, physical activity, body weight, smoking, marital status, medical conditions, and medications. Previous biennial questionnaires since 1986 asked about date of birth, alcohol intake, and other health information.
  
  
  RESULTS
  When men with prostate cancer were excluded, the age-standardized prevalence of erectile dysfunction in the previous 3 months was 33%. Many aspects of sexual function (including overall function, desire, orgasm, and overall ability) decreased sharply by decade after 50 years of age. Physical activity was associated with lower risk for erectile dysfunction (multivariable relative risk, 0.7 [95% CI, 0.6 to 0.7] for >32.6 metabolic equivalent hours of exercise per week vs. 0 to 2.7 metabolic equivalent hours of exercise per week), and obesity was associated with higher risk (relative risk, 1.3 [CI, 1.2 to 1.4] for body mass index >28.7 kg/m2 vs. <23.2 kg/m2). Smoking, alcohol consumption, and television viewing time were also associated with increased prevalence of erectile dysfunction. Men who had no chronic medical conditions and engaged in healthy behaviors had the lowest prevalence.
  
  
  CONCLUSIONS
  Several modifiable health behaviors were associated with maintenance of good erectile function, even after comorbid conditions were considered. Lifestyle factors most strongly associated with erectile dysfunction were physical activity and leanness.
authors.affiliation: Department of Nutrition, Harvard School of Public Health, Brigham and Woman's Hospital, 665 Huntington Avenue, Boston, Massachusetts 02115, USA.
authors.forename: Constance G
authors.initials: CG
authors.lastname: Bacon
authors.forename: Murray A
authors.initials: MA
authors.lastname: Mittleman
authors.forename: Ichiro
authors.initials: I
authors.lastname: Kawachi
authors.forename: Edward
authors.initials: E
authors.lastname: Giovannucci
authors.forename: Dale B
authors.initials: DB
authors.lastname: Glasser
authors.forename: Eric B
authors.initials: EB
authors.lastname: Rimm
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D003430:Cross-Sectional Studies; D007172:Erectile Dysfunction / Q000453:epidemiology*; D015438:Health Behavior; D006801:Humans; D008019:Life Style; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D011446:Prospective Studies; D012307:Risk Factors; D011795:Surveys and Questionnaires; D014481:United States / Q000453:epidemiology