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Table 1 Demographic characteristics between breast cancer patients and non-breast cancer subjects in 2000-2008

From: Association between chronic viral hepatitis infection and breast cancer risk: a nationwide population-based case-control study

Variables Total N= 9790 Breast cancer p-value*
    No N= 7832 Yes N= 1958  
  n (%) n (%) n (%)  
Age, years        1.00
   20-29 145 (1.5) 116 (1.5) 29 (1.5)  
   30-39 1305 (13.3) 1044 (13.3) 261 (13.3)  
   40-49 3630 (37.1) 2904 (37.1) 726 (37.1)  
   50-59 2665 (27.2) 2132 (27.2) 533 (27.2)  
   60-69 1205 (12.3) 964 (12.3) 241 (12.3)  
   ≥ 70 840 (8.6) 672 (8.6) 168 (8.6)  
Occupation        0.001
   White collar 5098 (52.1) 4014 (51.3) 1084 (55.4)  
   Blue collar 3538 (36.1) 2898 (37.0) 640 (32.7)  
   Others 1154 (11.8) 920 (11.8) 234 (12.0)  
Urbanization level        0.03
   1 3154 (32.2) 2480 (31.7) 674 (34.4)  
   2 2928 (29.9) 2335 (29.8) 593 (30.3)  
   3 1675 (17.1) 1351 (17.3) 324 (16.6)  
   4 2032 (20.8) 1666 (21.3) 366 (18.7)  
Region        0.24
   North 4762 (48.7) 3782 (48.3) 980 (50.1)  
   Central 1880 (19.2) 1495 (19.1) 385 (19.7)  
   South 2330 (23.8) 1888 (24.1) 442 (22.6)  
   East and Islands 817 (8.4) 667 (8.5) 150 (7.7)  
Income        0.0004
   < 15,000 3116 (31.8) 2481 (31.7) 635 (32.4)  
   15,000-29,999 5381 (55.0) 4365 (55.7) 1016 (51.9)  
   ≥ 30,000 1293 (13.2) 986 (12.6) 307 (15.7)  
  1. Urbanization level: 1 Indicate the highest level of urbanization and 4 the lowest
  2. *Chi-square test