title: [Trend analyses on the differences of lung cancer incidence between gender, area and average age in China during 1989-2008].
abstract: OBJECTIVE
  The lung cancer incidence was significantly increased in the past two decades in China. But the secular trend of lung cancer incidence difference between gender (male and female), area (urban and rural) and average age was not clear. The aim of this study is to analyze the trend of lung cancer incidence rate ratio between gender, area and average age in China during 1989-2008, and provide some inspiration for lung cancer prevention and control activities.
  
  
  METHODS
  Cancer registry data and population data in China from 1989 to 2008 were collected by the National Cancer Registration Center. Stratified for gender and area, Poisson regression model was used to estimate annual lung cancer incidence rate ratio between male and female, urban and rural areas. The average age of lung cancer incidence was calculated. Linear regression was used to model the trend of annual incidence rate ratio and average age over time.
  
  
  RESULTS
  Incidence rate ratios of lung cancer between male and female, urban and rural areas were significantly decreased from 2.47 and 2.07 to 2.28 and 1.14 during 1989-2008, respectively. Meanwhile, the average age of lung cancer incidence among male and female dramatically increased from 65.32 and 65.14 to 67.87 and 68.05, respectively.
  
  
  CONCLUSIONS
  The difference of lung cancer incidence between male and female, urban and rural areas remarkably decreased from 1989 to 2008. The average age of lung cancer occurrence gradually increased. Researches, prevention and control activities on lung cancer with consideration of new incidence pattern should be strengthened.
authors.affiliation: Jiangsu Provincial Center for Disease Prevention and Control, Nanjing 210009, China.
authors.forename: Renqiang
authors.initials: R
authors.lastname: Han
authors.forename: Rongshou
authors.initials: R
authors.lastname: Zheng
authors.forename: Siwei
authors.initials: S
authors.lastname: Zhang
authors.forename: Ming
authors.initials: M
authors.lastname: Wu
authors.forename: Wanqing
authors.initials: W
authors.lastname: Chen
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D002675:Child, Preschool; D002681:China / Q000453:epidemiology; D005260:Female; D049673:History, 20th Century; D049674:History, 21st Century; D006801:Humans; D015994:Incidence; D007223:Infant; D008175:Lung Neoplasms / Q000453:epidemiology* / Q000266:history; D008297:Male; D008875:Middle Aged; D012737:Sex Factors; D055815:Young Adult
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