title: Prevalence and factors associated with hidradenitis suppurativa: results from two case-control studies.
abstract: BACKGROUND
  Conflicting opinions have been reported regarding the epidemiology of hidradenitis suppurativa.
  
  
  OBJECTIVE
  We sought to evaluate the prevalence of hidradenitis suppurativa and to identify associated factors.
  
  
  METHODS
  Prevalence was evaluated using a representative sample of the French population (n=10,000). Associated risk factors were assessed using two case-control studies, one population-based with 67 self-reported patients and 200 control subjects, and the other clinic-based with 302 medically assessed patients and 906 control subjects.
  
  
  RESULTS
  The prevalence was 1% of the French population. Multivariate analyses showed a strong association with current smoking in self-reported (odds ratio=4.16, 95% confidence interval [2.99-8.69]) and in medically assessed (odds ratio=12.55 [8.58-18.38]) populations. Association with body mass index was significant in medically assessed patients (odds ratio=1.12 [1.08-1.15]) for each increase of 1 U of BMI.
  
  
  CONCLUSIONS
  A causal relationship could not be established with such a cross-sectional study.
  
  
  CONCLUSIONS
  Hidradenitis suppurativa is a common disease, frequently associated with smoking and being overweight.
authors.affiliation: AP-HP, Groupe Henri-Mondor Albert-Chenevier, Service de Dermatologie, Creteil, France, Universite Paris 12, Faculte de Medecine, Creteil, France.
authors.forename: Jean E
authors.initials: JE
authors.lastname: Revuz
authors.forename: Florence
authors.initials: F
authors.lastname: Canoui-Poitrine
authors.forename: Pierre
authors.initials: P
authors.lastname: Wolkenstein
authors.forename: Cedric
authors.initials: C
authors.lastname: Viallette
authors.forename: Germaine
authors.initials: G
authors.lastname: Gabison
authors.forename: Florence
authors.initials: F
authors.lastname: Pouget
authors.forename: Florence
authors.initials: F
authors.lastname: Poli
authors.forename: Ousmane
authors.initials: O
authors.lastname: Faye
authors.forename: Jean Claude
authors.initials: JC
authors.lastname: Roujeau
authors.forename: Genevieve
authors.initials: G
authors.lastname: Bonnelye
authors.forename: Jean Jacques
authors.initials: JJ
authors.lastname: Grob
authors.forename: Sylvie
authors.initials: S
authors.lastname: Bastuji-Garin
mesh_terms: D000328:Adult; D000428:Alcohol Drinking / Q000453:epidemiology; D016022:Case-Control Studies; D015984:Causality; D015897:Comorbidity; D005260:Female; D005602:France / Q000453:epidemiology; D017497:Hidradenitis Suppurativa / Q000453:epidemiology*; D006801:Humans; D008297:Male; D015999:Multivariate Analysis; D009765:Obesity / Q000453:epidemiology; D016017:Odds Ratio; D015995:Prevalence; D012307:Risk Factors; D012907:Smoking / Q000453:epidemiology