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Table 1 Distribution of selected characteristics by case-control status in NPC association analysis.

From: Genetic polymorphisms of MDM2 and TP53 genes are associated with risk of nasopharyngeal carcinoma in a Chinese population

  Cases Controls
  n % n %
Sex     
Male 315 60.3 404 56.7
Female 207 39.7 308 42.7
Age (years)     
≤40 195 37.4 242 34.0
41-50 134 25.7 186 26.1
51-60 93 17.8 166 23.3
>60 100 19.1 118 16.6
Tumor stage     
I 126 24.2   
II 208 39.8   
III 177 33.9   
IV 11 2.1   
EBV Infection status     
Positive 329 63.1   
Negative 162 31.0   
Data missing 31 5.9   
Metastasis     
Present 283 54.2   
Absent 239 45.8