Table1.

Correlation between the 16-item Parkinson Fatigue Scale score and change in Hoehn & Yahr stage (n=56)

Number	Question	Score (mean±SD)	Correlation with H&Y aggravation (p value/ρ)
Q-1	I have to rest during the day	3.51±1.22	0.184/
Q-2	My life is restricted by fatigue	3.25±1.31	0.035/0.28
Q-3	I get tired more quickly than other people I know	3.67±1.02	0.820/
Q-4	Fatigue is one of my three worst symptoms	3.42±1.21	0.054/
Q-5	I feel completely exhausted	3.33±1.08	0.041/0.27
Q-6	Fatigue makes me reluctant to socialise	3.33±1.23	0.010/0.33
Q-7	It takes me longer to get things done because of fatigue	3.62±1.12	0.050/
Q-8	I have a feeling of heaviness	3.41±1.10	0.423/
Q-9	If I wasn’t so tired I could do more things	3.50±1.17	0.003/0.38
Q-10	Everything I do is an effort	3.41±1.20	0.011/0.33
Q-11	I feel tired for much of the time	3.10±1.10	0.066/
Q-12	I feel totally drained	3.05±1.16	0.004/0.37
Q-13	Fatigue makes it difficult for me to cope with everyday activities	3.17±1.19	0.009/0.34
Q-14	I feel tired even when I haven’t done anything	2.98±1.15	0.009/0.34
Q-15	Because of fatigue I do less in my day than I would like	3.26±1.21	0.037/0.27
Q-16	I get so tired I want to lie down wherever I am	3.14±1.13	0.003/0.38
Mean		3.32±0.99	0.019/0.31

a) SD: standard deviation. H&Y: Hoehn & Yahr. ρ: Spearman’s rank correlation coefficient.

b) In this table, we present the original version of PFS-16. We used the Japanese version of PFS-16 in the actual questionnaire.