Abstracts

Rationale: We aimed to assess the validity of a single-item global measure of satisfaction with epilepsy surgery among adult patients who underwent epilepsy surgery. Methods: 112 patients who had epilepsy surgery >1 year earlier at four different centres completed two sets of questionnaires 6 weeks apart. The single item measuring epilepsy surgery satisfaction asked: “Taking into account all aspects of your epilepsy surgery, how satisfied or dissatisfied are you with your epilepsy surgery”? Responses were 7-point Likert type ranging from 1= extremely dissatisfied to 7=extremely satisfied. Test-retest reliability was assessed with the intra-class correlation coefficient (ICC). Polychoric and polyserial correlation assessed construct validity of the single item measure of satisfaction with validated questionnaires including EuroQOL five dimensions questionnaire (EQ-5D-5L), the Patient Health Questionnaire (PHQ-9), Marlowe-Crowne Social Desirability Scale (MCSD), Treatment Satisfaction Questionnaire for Medication (TSQM-II), Global Assessment of Severity of Epilepsy (GASE), Global Assessment of Disability for Seizure Disorders (GADS), and Patient-Weighted Quality of Life in Epilepsy (QOLIE-31-P). Results: Mean age was 41.7 years (SD=13.6), 53% were women, mean time since surgery was 6.5 years, 71% temporal lobe surgery, 54% were seizure free, and 12.5% had surgical adverse effects. The single-item global measure of satisfaction with epilepsy surgery had very good test-retest reliability (ICC = 0.79), high to moderate correlations in the expected direction with GASE (0.62; p<0.01), QOLIE-31-P (0.61; p<0.01), GADS (0.60; p<0.01), EQ-5D-5L (0.52; p<0.01), and PHQ-9 (-0.45; p<0.01). As expected, they were low for MCSD (0.33; p<0.01). Conclusions: This single-item global measure of epilepsy surgery satisfaction showed good reliability and construct validity. This makes it an appealing tool which can be easily implemented in busy clinical settings to assess satisfaction after epilepsy surgery. Funding: No funding