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Table 1 Distribution of study variables by socioeconomic status (SES), breast cancer diagnosed in 1998-2002

From: Socioeconomic disparities in breast cancer survival: relation to stage at diagnosis, treatment and race

   Percentage of area-based SES group  
  Number of cases Highest SES Upper middle Lower middle Lowest SES p-value
Age at diagnosis (year)     <0.0001
   15-44 15520 14.4 14.0 12.4 14.4  
   45-54 26545 25.2 23.3 22.3 23.6  
   55-64 25545 23.3 23.2 21.9 22.5  
   65-74 22462 18.6 19.7 21.1 20.3  
   75+ 22471 18.4 19.8 22.3 19.2  
Year of diagnosis     <0.0001
   1998 22134 19.4 18.4 21.4 19.4  
   1999 22487 19.5 18.7 21.3 20.1  
   2000 22385 20.2 21.0 18.6 20.0  
   2001 22791 20.3 20.9 19.6 20.2  
   2002 22746 20.6 21.0 19.1 20.3  
Race     <0.0001
   White 92717 90.8 79.7 85.4 74.4  
   Black 9831 4.3 7.2 6.3 16.1  
   Other 9995 4.9 13.1 8.3 9.5  
Rural/urban residence     <0.0001
   Rural 9819 2.7 4.0 23.1 4.0  
   Urban 102724 97.3 96.0 76.9 96.0  
AJCC stage     <0.0001
   I 50608 46.7 45.7 46.6 41.4  
   II 41646 36.2 37.1 35.1 39.5  
   III 7188 5.7 5.8 5.5 8.3  
   IV 4770 3.8 4.1 4.3 4.7  
   Unknown 8331 7.6 7.3 8.5 6.2  
Number of positive lymph nodes     <0.0001
   None 60700 64.9 64.0 65.4 60.2  
   1-3 21948 22.8 23.2 21.9 23.9  
   ≥ 4 12896 12.3 12.8 12.7 16.0  
First course treatment received     
   Surgery 106076 95.3 94.5 93.6 93.8 <0.0001
   Radiation 58144 57.3 55.1 47.8 47.7 <0.0001
  1. † AJCC: American Joint Committee on Cancer.