title: [A case-control study on the risk factors of Alzheimer's disease in military elderly men].
abstract: OBJECTIVE
  To investigate the risk of Alzheimer's disease (AD) associated with life style, early exposure to magnetic fields, family history of dementia and other risk factors.
  
  
  METHODS
  We conducted a case-control study among the inpatients of Chinese PLA General Hospital in 2000 - 2003. Sixty-two AD cases and 124 controls were selected and matched for age. Univariate and multivariate analyses were conducted using logistic regression model.
  
  
  RESULTS
  All subjects were males aged 66 to 102. In univariate analysis, lack of social activities, more physical exercises, early exposure to magnetic fields, suffering from negative life events and family history of dementia were statistically different between two groups (P < 0.05). Multivariate analysis showed that after adjusting for potential confounders, suffering from negative life events, family histories of dementia increased the risk of AD with odds ratio (OR) and 95% confidence interval (CI) 3.27 (1.53 - 6.97) and 5.78 (1.39 - 24.10). Early exposure to magnetic fields seemed a possible risk factor for AD, with OR (95% CI) 2.49 (0.96 - 6.45). The amount of social activities, cigarette smoking and history of cancers were negatively correlated with AD and their ORs (95% CI) were 0.81 (0.72 - 0.92), 0.46 (0.21 - 1.00) and 0.31 (0.12 - 0.82) respectively.
  
  
  CONCLUSIONS
  The study demonstrated that suffering from negative life events and family history of dementia were risk factors for AD, and the early exposure to magnetic fields might also play a role.
authors.affiliation: Institute of Geriatrics, Chinese PLA General Hospital, Beijing 100853, China.
authors.forename: Qing
authors.initials: Q
authors.lastname: Chang
authors.forename: Yao
authors.initials: Y
authors.lastname: He
authors.forename: Bin
authors.initials: B
authors.lastname: Ni
authors.forename: Kang
authors.initials: K
authors.lastname: Feng
authors.forename: Yong
authors.initials: Y
authors.lastname: Jiang
authors.forename: Bin
authors.initials: B
authors.lastname: Jiang
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000544:Alzheimer Disease / Q000453:epidemiology* / Q000209:etiology; D016022:Case-Control Studies; D002681:China / Q000453:epidemiology; D004574:Electromagnetic Fields / Q000009:adverse effects*; D006801:Humans; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D008889:Military Personnel; D016273:Occupational Exposure; D012307:Risk Factors; D012907:Smoking / Q000009:adverse effects