Translation and validation of a Spanish version of the xerostomia inventory.
OBJECTIVE
The aim of this study was to validate a Spanish cross-cultural adaptation of the xerostomia inventory (XI).


METHODS
The original English version of XI was translated into Spanish, cross-culturally adapted and field tested. The Spanish version of XI (XI-Sp) was tested with a sample of 41 patients with xerostomia. The reliability of the XI-Sp was determined through internal consistency and test-retest methods. The construct validity of XI-Sp was determined by means of correlation between XI-Sp scores and salivary flow measurements.


RESULTS
Overall XI-Sp scores were 40.8 (SD = 10) for the first application and 40.2 (SD = 9.5) for the second. Cronbach's alpha value for the XI-Sp was 0.89 and 0.87, respectively, while interitem correlation averages were r = 0.44 and r = 0.39 for each application. Interitem correlation and corrected total was rc≥0.30. The test-retest intraclass correlation coefficient value for the XI-Sp score was 0.59 and 0.91. Convergent validity for construct validity correlation with salivary flow showed a medium effect size (r2= 0.10) for the first application but did not make a statistically significant prediction for the second (r2= 0.7).


CONCLUSIONS
This study provides evidence concerning the reliability of the XI-Sp, showing that it may be a useful tool for Spanish-speaking xerostomia patients for both clinical and epidemiologic research.
Department of Restorative Dentistry, Universidad de Concepción School of Dentistry, Concepción, Chile. carserra@udec.cl.
Carlos
C
Serrano
Dentistry Cost Center, Victor Ríos Ruiz Los Angeles Health Center, Los Angeles, Chile.
María P
MP
Fariña
Department of Medical Education, Universidad de Concepción School of Medicine, Concepción, Chile.
Cristhian
C
Pérez
Pharmacy Department, Pharmacy School, Universidad de Concepción, Concepción, Chile.
Marcos
M
Fernández
Department of Nutrition and Dietetics, Pharmacy School, Universidad de Concepción, Concepción, Chile.
Katherine
K
Forman
Department of Surgical Stomatology, School of Dentistry, Universidad de Concepción, Concepción, Chile.
Mauricio
M
Carrasco
D006801:Humans; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires / Q000592:standards*; D014175:Translating; D014987:Xerostomia / Q000175:diagnosis
salivary secretion; translation and validation; xerostomia; xerostomia inventory