psychometric evaluation of the persian version of the quality of life in epilepsy inventory-31.

background: health assessment in patients  with epilepsy (pwe) should  include  both  clinical outcomes and  health related quality of life (hrqol) measures. the quality of life (qol) in epilepsy-31 inventory  (qolie-31) is widely used for qol studies  in epilepsy. this study  aims to evaluate psychometrics  of the persian version of the inventory (qolie-31-p). methods:  following a  standard  forward-backward translation  and cultural adaptation, the construct  validity of the qolie-31-p  was  assessed  by  explanatory factor analysis, multi-trait  scaling  analysis, and  known group comparison. the criterion validity  was   assessed   by calculating   the   pearson   correlation   to  sf-36 (36-item short-form health  survey). the reliability was assessed  by calculating cronbach’s alpha and test-retest study. results: the  factor analysis  extracted   from  8  factors explaining  70.35%  of  the  variations. item-scale correlations  revealed  that  individual items  significantly had  the strongest  association  with  the  domain   they were  loaded on. the pearson  coefficient  of correlation between qolie-31-p and the overall scores of sf-36 was 0.876  (p <  0.0001).  patient  with  medically  controlled seizures  scored  higher than  those  who  experienced seizures   during the  previous year  to  study  date (p <  0.0001).  the cronbach’s   α  of  overall  qolie-31-p inventory  was 0.9. the overall test-retest coefficient  of correlation was 0.68 (p = 0.003). conclusion: qolie-31-p is a valid and reliable tool to be applied in health assessment of patients with epilepsy.