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Table 2 Distribution of selected characteristics of the papillary thyroid cancer cases and controls

From: A case-control study of exposure to organophosphate flame retardants and risk of thyroid cancer in women

  Cases (n = 100) Control (n = 100)  
N or %a N or (%)a p-valueb
Age    0.47
  < 40 23 17  
 40–49 24 28  
 50–59 39 31  
 60–69 19 15  
  > =70 4 9  
Years of education    0.009
 High school or less 25 9  
 College/Technical school 47 55  
 Graduate/Professional school 25 35  
 Other 3 1  
Family income    0.83
 Below poverty level 6 5  
 Above poverty level 71 68  
 Unknown 23 27  
BMI    0.18
  < 25 32 38  
 25–29.99 32 38  
  > =30 36 24  
Family history of thyroid cancer    0.39
 No 49 49  
 Thyroid Cancer 16 10  
 Other Cancer 35 41  
Thyroid disease    0.02
 Yes 14 4  
 No 86 96  
Smoking    0.76
 Yes 29 32  
 No 71 68  
Alcohol consumption    0.20
 Yes 37 47  
 No 63 53  
Tumor diameter   
  ≤ 1 cm 47  
  > 1 cm and ≤ 2 cm 29  
  > 2 cm 22  
 Not available 2  
  1. aThe frequency and percentage are equivalent because the number of cases and controls each equals 100
  2. bBased on chi-squared test or Fisher’s exact test when ≥1 cell has an expected frequency ≤ 5