Methods: A cross-sectional study was carried out with patients treated for oral cancer at least 6 months post-treatment
and a gender and age group matched control group. HRQoL was measured with the 12-Item Short Form Health Survey
(SF-12); oral HRQoL (OHRQoL) was evaluated using the Oral Health Impact Profile (OHIP-14) and the Oral Impacts on
Daily Performances (OIDP). Multivariable regression models assessed the association between the outcomes (SF-12,
OHIP-14 and OIDP) and the exposure (patients versus controls), adjusting for sex, age, social class, functional tooth units
and presence of illness