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Table 1 Frequency distribution of cases and matched population controls (number and percentage)

From: Prescriptions for selective cyclooxygenase-2 inhibitors, non-selective non-steroidal anti-inflammatory drugs, and risk of breast cancer in a population-based case-control study

Characteristic   Cases* Controls*
  P-value N = 8,195 % N = 81,950 %
Selective Cox-2 Inhibitors 0.007     
   No   7,362 89.8 74,360 90.7
   Yes   701 8.6 6,314 7.7
Non-selective Non-aspirin 0.02     
Non-Steroidal Anti- Inflammatory Drugs      
   No   6,361 77.6 64,549 78.8
   Yes   1,834 22.4 17,401 21.2
Low Dose Aspirin 0.93     
   No   7,414 90.5 74,115 90.4
   Yes   781 9.5 7,835 9.6
High Dose Aspirin 0.28     
   No   8,168 99.7 81,733 99.7
   Yes   27 0.3 217 0.3
Acetaminophen 0.64     
   No   7,317 89.3 73,033 89.1
   Yes   878 10.7 8,917 10.9
Rheumatoid Arthritis 0.70     
   No   7,640 93.2 76,490 93.3
   Yes   555 6.8 5,460 6.7
Migraine 0.002     
   No   7,797 95.1 78,571 95.9
   Yes   398 4.9 3,379 4.1
Hormone Replacement Therapy <0.001     
   Never   6,248 76.2 66,132 80.7
   Ever   1,947 23.8 15,818 19.3
  1. *Matched on county of residence and birth year
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