OHIP domains and total scores (1) Chewing ability Mann-Whitney U Test (CI95%)   Disability OHIP Mean scores Competent OHIP Mean scores   Functional limitation 1.02 .43 P= .002 Physical pain 2.67 1.45 P< .001 Psychological discomfort 3.02 2.03 P= .018 Physical disability 1.93 .61 P< .001 Psychological disability 1.82 .77 P< .001 Social disability 1.07 .77 P= .45 Handicap .75 .35 P= .12 OHIP Total Scores 12.28 6.41 P< .001 (1) OHIP-14: higher score indicates poorer quality of life

Table 4: The impact of the Index of Chewing Ability classified into two categories, chewing competence and chewing disability, over the quality of life measured by the Oral Health Impact Profile (OHIP-14) questionnaire.