Araştırma Makalesi

Comparative and Incremental Validity of NMSQuest, NMSS, and MDS-NMS With External Validation of a Conversion Equation in Parkinson’s Disease

Cilt: 48 Sayı: 6 22 Eylül 2026
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Comparative and Incremental Validity of NMSQuest, NMSS, and MDS-NMS With External Validation of a Conversion Equation in Parkinson’s Disease

Öz

Non-motor symptoms contribute to disability in Parkinson’s disease (PD), but instruments differ in format, content, and scoring. This study compared the Non-Motor Symptoms Questionnaire (NMSQuest), Non-Motor Symptoms Scale (NMSS), and Movement Disorder Society Non-Motor Rating Scale (MDS-NMS), externally evaluated the published NMSS-to-MDS-NMS conversion equation, and assessed incremental validity after reducing direct content overlap. Seventy-eight patients with idiopathic PD evaluated at a movement disorders clinic between January and March 2026 completed the NMSQuest, NMSS, MDS-NMS, Hospital Anxiety and Depression Scale, Parkinson’s Disease Sleep Scale-2, and MDS-Unified Parkinson’s Disease Rating Scale Part III. Associations were examined using Spearman correlations with bootstrap confidence intervals. External validation included calibration, predictive R², error measures, Lin’s concordance correlation coefficient, and Bland–Altman analysis. Hierarchical regression was used to assess incremental validity. The three instruments were moderately correlated (ρ = 0.506–0.528), indicating related but non-equivalent measurement of non-motor burden. The published equation underestimated MDS-NMS scores by 10.1 points (95% CI, 2.9–17.5). The calibration slope was 0.662, predictive R² was 0.121, and mean absolute error was 27.8; limits of agreement were wide, with significant proportional bias. Recalibration improved apparent performance but remained exploratory. In analyses using domain-excluded NMSS and MDS-NMS scores, the two clinician-rated scales contributed comparably to anxiety, whereas only the MDS-NMS contributed independently to sleep disturbance. No scale showed an independent association with depression. The instruments captured related but non-equivalent aspects of non-motor burden. The conversion equation showed limited transportability for patient-level score conversion and requires further multicenter external validation.

Anahtar Kelimeler

Destekleyen Kurum

Financial Disclosure: The authors declared that this study received no financial support.

Etik Beyan

Ethics Committee Approval: The study was approved by the Tekirdağ Namık Kemal University Faculty of Medicine Non-Interventional Clinical Research Ethics Committee (Protocol no: 2026.177.06.07). Informed Consent: Written informed consent was obtained from all participants.

Teşekkür

None.

Kaynakça

  1. 1. Schapira AHV, Chaudhuri KR, Jenner P. Non-motor features of Parkinson disease. Nat Rev Neurosci. 2017;18(7):435-50.
  2. 2. Bock MA, Brown EG, Zhang L, Tanner C. Association of motor and nonmotor symptoms with health-related quality of life in a large online cohort of people with Parkinson disease. Neurology. 2022;98(22):e2194-203.
  3. 3. Heimrich KG, Schönenberg A, Santos-García D, Mir P, Prell T. The impact of nonmotor symptoms on health-related quality of life in Parkinson’s disease: a network analysis approach. J Clin Med. 2023;12(7):2573.
  4. 4. Chaudhuri KR, Martinez-Martin P, Schapira AHV, Stocchi F, Sethi K, Odin P, et al. International multicenter pilot study of the first comprehensive self-completed nonmotor symptoms questionnaire for Parkinson’s disease: the NMSQuest study. Mov Disord. 2006;21(7):916-23.
  5. 5. Chaudhuri KR, Martinez-Martin P, Brown RG, Sethi K, Stocchi F, Odin P, et al. The metric properties of a novel non-motor symptoms scale for Parkinson’s disease: results from an international pilot study. Mov Disord. 2007;22(13):1901-11.
  6. 6. Chaudhuri KR, Schrag A, Weintraub D, Rizos A, Rodriguez-Blazquez C, Mamikonyan E, et al. The Movement Disorder Society Nonmotor Rating Scale: initial validation study. Mov Disord. 2020;35(1):116-33.
  7. 7. van Wamelen DJ, Rota S, Schrag A, Rizos A, Martinez-Martin P, Weintraub D, et al. Characterization of non-motor fluctuations using the Movement Disorder Society Non-Motor Rating Scale. Mov Disord Clin Pract. 2022;9(7):932-40.
  8. 8. Garon M, Rojo-Albuin JM, Chaudhuri KR, Rizos A, Rodriguez-Blazquez C, Mamikonyan E, et al. Conversion between NMSS and MDS-NMS in Parkinson’s disease. Mov Disord. 2025;40(5):813-20.

Ayrıntılar

Birincil Dil

İngilizce

Konular

Nöroloji ve Nöromüsküler Hastalıklar

Bölüm

Araştırma Makalesi

Yayımlanma Tarihi

22 Eylül 2026

Gönderilme Tarihi

19 Temmuz 2026

Kabul Tarihi

18 Ağustos 2026

Yayımlandığı Sayı

Yıl 2026 Cilt: 48 Sayı: 6

Kaynak Göster

APA
Gündoğdu, A., & Kahveci Erdemir, N. (2026). Comparative and Incremental Validity of NMSQuest, NMSS, and MDS-NMS With External Validation of a Conversion Equation in Parkinson’s Disease. Osmangazi Tıp Dergisi, 48(6), 1087-1099. https://doi.org/10.20515/otd.1998774
AMA
1.Gündoğdu A, Kahveci Erdemir N. Comparative and Incremental Validity of NMSQuest, NMSS, and MDS-NMS With External Validation of a Conversion Equation in Parkinson’s Disease. Osmangazi Tıp Dergisi. 2026;48(6):1087-1099. doi:10.20515/otd.1998774
Chicago
Gündoğdu, Aslı, ve Nihan Kahveci Erdemir. 2026. “Comparative and Incremental Validity of NMSQuest, NMSS, and MDS-NMS With External Validation of a Conversion Equation in Parkinson’s Disease”. Osmangazi Tıp Dergisi 48 (6): 1087-99. https://doi.org/10.20515/otd.1998774.
EndNote
Gündoğdu A, Kahveci Erdemir N (01 Eylül 2026) Comparative and Incremental Validity of NMSQuest, NMSS, and MDS-NMS With External Validation of a Conversion Equation in Parkinson’s Disease. Osmangazi Tıp Dergisi 48 6 1087–1099.
IEEE
[1]A. Gündoğdu ve N. Kahveci Erdemir, “Comparative and Incremental Validity of NMSQuest, NMSS, and MDS-NMS With External Validation of a Conversion Equation in Parkinson’s Disease”, Osmangazi Tıp Dergisi, c. 48, sy 6, ss. 1087–1099, Eyl. 2026, doi: 10.20515/otd.1998774.
ISNAD
Gündoğdu, Aslı - Kahveci Erdemir, Nihan. “Comparative and Incremental Validity of NMSQuest, NMSS, and MDS-NMS With External Validation of a Conversion Equation in Parkinson’s Disease”. Osmangazi Tıp Dergisi 48/6 (01 Eylül 2026): 1087-1099. https://doi.org/10.20515/otd.1998774.
JAMA
1.Gündoğdu A, Kahveci Erdemir N. Comparative and Incremental Validity of NMSQuest, NMSS, and MDS-NMS With External Validation of a Conversion Equation in Parkinson’s Disease. Osmangazi Tıp Dergisi. 2026;48:1087–1099.
MLA
Gündoğdu, Aslı, ve Nihan Kahveci Erdemir. “Comparative and Incremental Validity of NMSQuest, NMSS, and MDS-NMS With External Validation of a Conversion Equation in Parkinson’s Disease”. Osmangazi Tıp Dergisi, c. 48, sy 6, Eylül 2026, ss. 1087-99, doi:10.20515/otd.1998774.
Vancouver
1.Aslı Gündoğdu, Nihan Kahveci Erdemir. Comparative and Incremental Validity of NMSQuest, NMSS, and MDS-NMS With External Validation of a Conversion Equation in Parkinson’s Disease. Osmangazi Tıp Dergisi. 01 Eylül 2026;48(6):1087-99. doi:10.20515/otd.1998774


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