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Table 1 General characteristics of the study subjects

From: Biomarkers of thyroid function and autoimmunity for predicting high-risk groups of thyroid cancer: a nested case–control study

  Controls (n = 257) Cases (n = 257) P-value
Age (years), means 49.4 ± 8.9 49.4 ± 8.9 0.994
BMI (kg/m2)    
  <23 125(48.6) 95(37.0) 0.019
  23 - <25 68(26.5) 75(29.2)  
  ≥ 25 64(24.9) 87(33.9)  
Family history of cancer (yes)a 93(41.0) 108(46.4) 0.245
Family history of thyroid cancer (yes)a 5(2.2) 6(2.6) 0.794
Educational level    
  Elementary school or less 21(8.8) 23(9.8) 0.774
  Middle school 19(7.9) 16(6.8)  
  High school 95(39.6) 84(35.9)  
  College or more 105(43.8) 115(47.4)  
Monthly household incomeb    
  <200 35(16.6) 24(11.8) 0.102
  200 - <400 56(26.5) 72(35.3)  
  >400 120(56.9) 108(52.9)  
Marital status    
  Married 218(90.8) 215(90.0) 0.480
  Unmarried 8(3.3) 5(2.1)  
  Divorced/Widowed 14(5.8) 19(8.0)  
Smoking status    
  Nonsmoker 147(64.8) 158(69.3) 0.215
  Former smoker 33(14.5) 37(16.3)  
  Current smoker 47(20.7) 33(14.5)  
Alcohol consumption    
  Nondrinker 87(36.4) 100(41.5) 0.208
  Former drinker 7(2.9) 12(5.0)  
  Current drinker 145(60.7) 129(53.5)  
Age at menarche (years)c    
  ≤13 35(22.0) 31(20.5) 0.680
  14 34(21.4) 34(22.5)  
  15 37(23.3) 28(18.5)  
  ≥16 53(33.3) 58(38.4)  
Menopause (yes)c 83(47.7) 79(43.9) 0.472
Age at menopause (years)c    
  <46 16(21.1) 12(17.7) 0.185
  46 - <49 14(18.4) 8(11.8)  
  49 - <52 14(18.4) 23(33.8)  
  ≥52 32(42.1) 25(36.8)  
Type of menopausec    
  Natural 57(71.3) 51(64.6) 0.366
  Surgery, Other 23(28.8) 28(35.4)  
Postmenopausal hormone use (ever)c 28(36.8) 20(30.8) 0.448
Parity (yes)c 157(96.3) 159(98.2) 0.315
  1. aFirst-degree relative.
  2. bUnit is 10,000 Korean won.
  3. cOnly in women.