Validation of the Thai SCOPA-Sleep Scale for Assessment of Sleep and Sleepiness in Patients with Parkinson’s Disease
Suwanna Setthawatcharawanich MD*, Kitti Limapichat MD*, Pornchai Sathirapanya MD*, Kanitpong Phabphal MD*
Affiliation : * Division of Neurology, Department of Medicine, Songklanagarind Hospital, Faculty of Medicine, Prince of Songkla University, Hat Yai, Songkhla, Thailand
Objective : To validate the Thai version of the Scale for Outcomes in Parkinson’s disease-Sleep Scale (SCOPA-Sleep scale) for
assessment of nighttime sleep problems (NSP) and daytime sleepiness (DS).
Material and Method: A Thai version of SCOPA-Sleep scale has been developed with the permission of the originator. Fifty-
one patients with Parkinson’s disease were asked to complete the Thai SCOPA-Sleep scale (consisting of NSP and DS
sections), plus the Pittsburg Sleep Quality Index (PSQI) and Epworth Sleepiness Scale (ESS). A second group of twenty
patients completed the Thai SCOPA-Sleep scale, twice, two weeks apart. The reliability and validity were subsequently
analyzed.
Results : The Thai SCOPA-Sleep scale showed a Cronbach’s alpha coefficient of 0.87 and 0.74 for SCOPA-NSP and SCOPA-
DS, respectively with no significant difference between initial and follow-up scores. The content validity of SCOPA-NSP and
SCOPA-DS were 0.9 and 0.9, respectively. There was a strong correlation between the Thai SCOPA-NSP and PSQI as well
as the Thai SCOPA-DS and ESS (p < 0.01 and p < 0.01, respectively).
Conclusion : The Thai SCOPA-Sleep scale is a reliable, valid instrument for assessing NSP and DS.
Keywords : Thai SCOPA-Sleep scale, Parkinson’s disease, Nighttime sleep problem, Daytime sleepiness
