Table 7.
Correlation measures using Spearman rank correlation coefficient measures between the various variables and fatigue scores.
| Variable | r | P |
|---|---|---|
| Age | — | N.S. |
| UPDRS domain 3 | −0.2380 | =0.0064 |
| UPDRS domain 4 | −0.1968 | 0.0237 |
| CIRS total | — | N.S. |
| CIRS domain 1 | — | N.S. |
| HADS anxiety domain | −0.3948 | <0.0001 |
| HADS depression domain | −0.4171 | <0.0001 |
| Frontal assessment battery | 0.3374 | =0.0001 |
| NMSQuest total | −0.3122 | =0.0003 |
| NMSQuest sleep domain | −0.2823 | =0.0009 |
| Other NMSQuest domains | — | N.S. |
| Hoehn & Yahr staging | −0.2882 | =0.0007 |
| PDQ-8 | −0.367 | <0.0001 |
| NMSS total | −0.3924 | <0.0001 |
| NMSS cardiovascular domain | −0.2985 | =0.0004 |
| NMSS sexual function domain | −0.2576 | =0.003 |
| NMSS sleep domain | −0.3908 | <0.0001 |
| NMSS mood domain | −0.3766 | <0.0001 |
| NMSS attention/memory domain | −0.2574 | =0.003 |
| NMSS misc. domain | −0.2666 | 0.002 |
| Other NMSS domains | — | N.S. |
The key correlations (P < 0.0001) are highlighted (N.S.: not significant, UPDRS: unified Parkinson's disease rating scale, CIRS: cognitive impairment rating scale, HADS: hospital anxiety and depression scale, NMSQuest: nonmotor symptom questionnaire, NMSS: nonmotor symptom scale).