title: Prevalence of and risk factors for asymptomatic inﬂammatory (NIH-IV) prostatitis in Chinese men.
abstract: BACKGROUND
  While many investigators have studied symptomatic prostatitis, little research has been done with regard to asymptomatic (NIH-IV) prostatitis.
  
  
  OBJECTIVE
  To describe the prevalence of and risk factors for NIH-IV prostatitis among a large male population.
  
  
  METHODS
  The study population was comprised of 1,868 men at the second phase recruitment of a population-based cohort in China. Asymptomatic and symptomatic men were defined by the National Institutes of Health Chronic Prostatitis (CP) Symptom Index. Meanwhile, EPS specimens and their leukocyte count were collected. Lifestyle and demographic characteristics were obtained through a questionnaire.
  
  
  RESULTS
  Prevalence of NIH-IV prostatitis was 21.1% among 1,868 asymptomatic men aged 19-78 years and increased with age. After adjusteing for potential confounding variables (age, smoking habits, alcohol drinking habits, education, physical activity, hypertension, dyslipidemia, obesity and diabetes), age remained a significant factor for NIH-IV prostatitis (OR = 1.35; 95% CI = 1.06-1.71; P = 0.01) and the risk of NIH-IV prostatitis was significantly higher in smokers≧15 pack/years than non-smokers (OR = 1.33; 95% CI = 1.01-1.75; P = 0.03). In addition, compared with non-drinkers, the OR of NIH-IV prostatitis in drinkers ≧1 drinks/week was 1.35 (95% CI = 1.03, 1.77, p = 0.02) after adjusting for the other variables above. In addition, having less than a college education may be a risk factor for NIH-IV prostatitis, although a statistically significant difference did not exist in our data (OR = 1.22; 95% CI = 0.97-1.52; P = 0.08).
  
  
  CONCLUSIONS
  Our findings suggest that NIH-IV prostatitis is prevalent in China. Age, smoking, drinking and lower education levels were associated with an increased risk of NIH-IV prostatitis. The prevalence of NIH-IV prostatitis should be taken into account when estimating the total prevalence of CP in future studies.
authors: Institute of Urology and Nephrology, First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi Zhuang Autonomous Region, China.
authors: Chunlei
authors: C
authors: Wu
authors: Zhifu
authors: Z
authors: Zhang
authors: Zheng
authors: Z
authors: Lu
authors: Ming
authors: M
authors: Liao
authors: Youjie
authors: Y
authors: Zhang
authors: Yuanliang
authors: Y
authors: Xie
authors: Xuefeng
authors: X
authors: Guo
authors: Xiaoxiang
authors: X
authors: Yu
authors: Xiaobo
authors: X
authors: Yang
authors: Yong
authors: Y
authors: Gao
authors: Aihua
authors: A
authors: Tan
authors: Zengnan
authors: Z
authors: Mo
mesh_terms: D000328:Adult; D000368:Aged; D002681:China / Q000453:epidemiology; D003430:Cross-Sectional Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D016017:Odds Ratio; D011159:Population Surveillance; D015995:Prevalence; D011472:Prostatitis / Q000453:epidemiology*; D012307:Risk Factors; D055815:Young Adult
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