title: Hay fever and hypertension in the US adult population.
abstract: OBJECTIVE
  Hypertension is associated with inflammation. Whether the inflammation caused by allergic diseases such as allergic rhinitis can predispose to hypertension is controversial. Therefore, we studied the association between hay fever and hypertension in the United States National Health and Nutrition Examination Survey (NHANES).
  
  
  METHODS
  We analyzed data on 1883 men and 2029 women in NHANES 2005-2006. We included participants aged 20 years or older who had valid data on hay fever and hypertension.
  
  
  RESULTS
  13.5% of the participants had a previous diagnosis of hay fever and 36.2% of them had hypertension. There were ethnic differences in the prevalence of previous hay fever diagnosis (p < 0.001) and hypertension (p < 0.001). There was no significant association between previous hay fever diagnosis and hypertension in men in any age group. The association between previous hay fever diagnosis and hypertension in women was significant in those aged 20-39 years (OR = 2.59, 95%CI = 1.26-5.30, p = 0.013). The association between previous hay fever diagnosis and hypertension in women aged form 20 to 39 years remained significant after adjustment for age, race and body mass index (OR = 2.74, 95%CI = 1.48-5.06, p = 0.003). After further adjustment for physical activity, alcohol consumption and smoking, the association was not attenuated (OR = 2.68, 95%CI = 1.38-5.18, p = 0.006). Further adjustment for liver enzymes, C-reactive protein and immunoglobulin E level attenuated the association slightly (OR = 2.72, 95%CI = 1.19-6.22, p = 0.021).
  
  
  CONCLUSIONS
  In this nationally representative population-based survey, previous hay fever diagnosis is not significantly associated with hypertension in adults overall. There is an association in subgroup of young women aged 20-39. Further work is needed to confirm that this is a true association.
authors.affiliation: Department of Medicine, University of Hong Kong, Queen Mary Hospital , Hong Kong , China.
authors.forename: Chao
authors.initials: C
authors.lastname: Li
authors.forename: Ching-Lung
authors.initials: CL
authors.lastname: Cheung
authors.forename: Tommy T
authors.initials: TT
authors.lastname: Cheung
authors.forename: Nithushi R
authors.initials: NR
authors.lastname: Samaranayake
authors.forename: Bernard M Y
authors.initials: BM
authors.lastname: Cheung
mesh_terms: D000328:Adult; D017677:Age Distribution; D000367:Age Factors; D001794:Blood Pressure; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D006973:Hypertension / Q000453:epidemiology* / Q000209:etiology / Q000503:physiopathology; D015994:Incidence; D008297:Male; D008875:Middle Aged; D009749:Nutrition Surveys / Q000379:methods*; D015995:Prevalence; D011379:Prognosis; D012189:Retrospective Studies; D006255:Rhinitis, Allergic, Seasonal / Q000150:complications / Q000175:diagnosis / Q000453:epidemiology*; D017678:Sex Distribution; D014481:United States / Q000453:epidemiology; D055815:Young Adult
keywords: Allergic rhinitis; NHANES; blood pressure; hypertension