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Table 2 Incidence rate of upper aerodigestive tract (UADT) and non-upper aerodigestive tract (non-UADT) second primary tumours by p16 status

From: HPV Status and second primary tumours in Oropharyngeal Squamous Cell Carcinoma

  Incidence rate per 100 patient-yrs (Confidence interval)  
  p16 + p16 - p-value
UADT 0.7 8.5 <0.0001*
  (0.3 – 1.4) (5.7 – 12.4)  
Non-UADT 0.9 2.1 0.116
  (0.9 – 4.7) (0.4 – 1.8)  
  1. p < 0.05 considered statistically significant.