Nonmotoric Symptoms Scale (NMSS) Validity and Reliability Test in Patients with Parkinson's Disease in Dr. Soetomo General Hospital, Surabaya, Indonesia: A Questioner Validation Study

Abstract

Background: Nonmotor symptoms are common but less reported in Parkinson's disease. it’s the cause of decreased quality of life and disability in many patients with Parkinson's disease compared to the motor symptom. Our study aimed to translate the original English-language version of the nonmotor symptom scale (NMSS) into the Indonesian version of the NMSS. And also to evaluate its validity and reliability for use in Indonesian-speaking Parkinson's disease patients. This for better and valid usage of NMSS scale in the Indonesian patient and health care provider Material and Method: This was descriptive-analytic study. Cross-cultural adaptation of NMSS and psychometric analysis of the Indonesian version of NMSS was carried out from 2 Teaching Hospital centers in Surabaya, East Java. Several other scales were also examined, including MMSE, ESS, BDI, and Scopa-Aut. A reliability test was performed using Alpha Cronbach. Results: A total of 35 patients were included in this study. the average age was 64.03±12.92 with the female sex 42.9% (n=15) and the male 57.1% (n=20), and Hoehn and Yahr stage II 57.1% (n=20). The total average NMSS is 11.64. The validity of contents and constructs of the NMSS on each domain has been proven valid. Internal reliability of internal consistency in these tools with an alpha Cronbach value of 0.836. Each domain correlates with several other scores including MMSE, BDI, ESS, and Scopa-aut. Conclusion: The Indonesian version of NMSS has good validity and reliability in assessing nonmotor symptoms in Parkinson's disease patients in Indonesia. Key words: Nonmotoric Symptoms Scale, Parkinson’s Disease, Validity, Validation