Translation and validation of Sinhala version of modified EORTC QLQ-OH15 in oral cancer patients who receive radiotherapy with or without chemotherapy in Sri Lanka

Table 3 Multi-trait scaling matrix of correlation coefficients for the study group

Item	Scales
Item	Eating	Gum and speech	Soreness
Have you had a dry mouth?	0.767^**	0.380^**	0.108
Have you had sticky saliva?	0.839^**	0.527^**	0.346^**
Has your mouth been sensitive to food and drink?	0.785^**	0.642^**	0.301^**
Have food and drink tasted different than usual?	0.892^**	0.551^**	0.345^**
Have you had problems eating solid foods?	0.855^**	0.579^**	0.478^**
Have you had pain in your gums?	0.386^**	0.784^**	0.251^*
Have you had problems with bleeding gums?	0.344^**	0.625^**	0.341^**
Have you had difficulty in opening your mouth wide?	0.438^**	0.762^**	0.511^**
Have you had trouble with talking?	0.386^**	0.784^**	0.251^*
Have you had lip sores?	0.303^**	0.499^**	0.764^**
Have you had soreness in your mouth?	0.385^**	0.452^**	0.791^**
Have you had sores in the corners of your mouth?	0.177	0.199	0.676^**

Item correlations with its own scale for item convergent validity are shown in bold typing
**Correlation is significant at the level 0.01
*Correlation is significant at the level 0.05

ISSN: 1472-6831