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Table 1 Demographic characteristics of breast cancer patients and controls

From: Methylation of WT1, CA10 in peripheral blood leukocyte is associated with breast cancer risk: a case-control study

Characteristics No. of Controls(%) No. of Cases (%) P Value
Age
 Mean ± SD 51.85 ± 10.31 51.75 ± 9.39  
  < 40 82(14.7) 41(10.2) 0.02
 40- 333(59.8) 274(68.2)
  ≥ 60 142(25.5) 87(21.6)
BMI
  ≤ 18.5 35(6.3) 14(3.5) 0.12
 18.5- 274(49.2) 211(52.5)
  ≥ 24.0 248(44.5) 177(44.0)
Urban and Rural Status
 Rural 236(42.4) 232(57.7) < 0.01
 Urban 321(57.6) 170(42.3)
Education Level
 Primary School or Below 162(29.1) 98(24.4) 0.27
 Middle School 175(31.4) 135(33.6)
 Senior School and Higher 220(39.5) 169(42.0)
Occupation Type a
 White Collar 273(49.0) 233(58.2) 0.01
 Blue Collar 284(51.0) 169(41.8)
Ethnicity
 Han 529(95.0) 386(96.0) 0.27
 Other 28(5.0) 16(4.0)
  1. a The white collar occupation referred to people work that need mental rather than physical effort, such as office, doctor, accountant, business, teacher, etc.; the blue collar occupation referred to people work as manual labor, such as worker, farmer, cleaner, etc.