borderline significancep = 0.05
Consistent with a recent multi-centre study [ 3 ], we observed a weak association between anti-HPV 16 IgG antibody levels and cancer of the oral cavity and pharynx, but the test for trend ranged from borderline significance in the initial model, adjusted for age and sex (p = 0.05) to non-significant (p = 0.13) when all the important confounding variables were retained, suggesting that some confounding by lifestyle may be important.