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Table 1 Baseline characteristics of study subjects

From: Association between dental amalgam fillings and Alzheimer’s disease: a population-based cross-sectional study in Taiwan

Variable Alzheimer’s disease   No Alzheimer’s disease   p-value
  (n = 5,906) (n = 201,681)  
  No. % No. %  
Age (year) 79.36 ± 7.14 74.87 ± 6.89 <.0001
Sex      0.1496
 Men 2,755 46.65 95,995 47.60  
 Women 3,151 53.35 105,686 52.40  
Income (NT$)      <.0001
 Dependent 2,472 41.86 84,740 42.02  
 1–20,000 1,518 25.70 44,260 21.95  
 20,001-40,000 1,866 31.59 69,890 34.65  
 >40,000 50 0.85 2,791 1.38  
Region      <.0001
 Area 1(Taipei) 1,659 28.09 65,573 32.51  
 Area 2 (Northern) 868 14.70 26,761 13.27  
 Area 3 (Central) 1256 21.27 36,693 18.19  
 Area 4 (Southern) 1,247 21.11 34,690 17.20  
 Area 5 (Kao-Ping) 739 12.51 32,141 15.94  
 Area 6 (Eastern) 137 2.32 5,823 2.89  
Amalgam filling      0.2274
 None 5,046 85.44 171,162 84.87  
 Yes 860 14.56 30,519 15.13  
  1. Age was mean ± S.E