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Table 1 Frequency distribution of demographic and risk factors in SCCHN cases and controls

From: Genetic variants of NOXA and MCL1 modify the risk of HPV16-associated squamous cell carcinoma of the head and neck

Characteristics Patients (n = 380) Controlsa (n = 335) P valueb
No. % No. %
Age (years)      0.526
 <40 32 8.4 27 8.1  
 41–55 142 37.4 109 32.5  
 56–70 159 41.8 157 46.9  
 >70 47 12.4 42 12.5  
Sex      0.100
 Male 285 75.0 269 80.3  
 Female 95 25.0 66 19.7  
 Ethnicity      
 Non-Hispanic white 380 100.0 335 100.0  
Tobacco smoking      0.588
 Ever 278 73.2 239 71.3  
 Never 102 26.8 96 28.7  
Alcohol drinking      
 Ever 296 77.9 240 71.6 0.054
 Never 84 22.1 95 28.4  
Tumor site      
 Oropharyngeal 187 49.2    
 Non-Oropharyngeal 193 50.8    
  1. a The controls were frequency matched to the patients on the factors shown in this table.
  2. b Two-sided χ 2 test.