Reliability and Validity of the Persian Version of the Fatigue Severity Scale in Idiopathic Parkinson’s Disease Patients
Table 2
Descriptive characteristics and the Spearman correlation of each item for internal consistency of the FSS questionnaire in Iranian Parkinson’s disease patients ().
Item
Mean
SD.
CV.
Spearman Rho
Corrected item/total correlation
Item 1 My motivation is lower when I am fatigued
4.6
2.3
50
0.803
0.760
Item 2 Exercise brings on my fatigue
4.6
2.2
47.8
0.865
0.816
Item 3 I am easily fatigued
4.2
2.4
57.1
0.827
0.760
Item 4 Fatigue interferes with my physical functioning
4.9
2.1
42.9
0.897
0.852
Item 5 Fatigue causes frequent problems for me
4.1
2.4
58.5
0.935
0.922
Item 6 My fatigue prevents sustained physical functioning
4.4
2.3
52.3
0.932
0.921
Item 7 Fatigue interferes with carrying out certain duties and responsibilities
4.2
2.2
52.4
0.910
0.893
Item 8 Fatigue is amongst my three most disabling symptoms
4.4
2.4
54.5
0.851
0.830
Item 9 Fatigue interferes with my work, family, or social life
3.8
2.3
60.5
0.848
0.799
Total score
4.4
2.0
45.4
—
—
SD.: standard deviation; CV.: coefficient of variation.
