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Parkinson¡¯s Disease:

(Brown et al, 2005)

• Using the full Likert scale, an average score of > 2.95 optimally distinguished those who experienced fatigue from those who did not with a sensitivity of 81.0% and specificity of 85.7.% (area under the curve 87.5%)
• Using the full Liker scale, a higher cut off of > 3.30 identified those perceiving fatigue to be a problem with a sensitivity of 84.7% with a specificity of 82.1% (area beneath the curve: 93.2%)
• Using the binary coding scoring a score of > 7 distinguished those who experienced fatigue from those who did not with a sensitivity of 73.8% and specificity of 76.9% (area under the curve: 87.1%)
• Using the binary coding scoring, a score of > 8 identified those perceiving fatigue to be a problem with a sensitivity of 89.5% with a specificity of 83.3% (area beneath the curve: 93.4%)

Parkinson's Disease

(Brown et al, 2005)

• Mean score of the 16 item PFS score (average item score) = 3.50 (2.94)
• Mean total score using binary scoring method = 8.51(4.98)

(Grace et al, 2007; n = 50, mean age = 71.66 (1.39); controls n = 16, mean age = 69.94 (2.42) years)

• Mean total PFS score for patients with PD: 54.34(34.81)
• Mean total PFS score for community elderly controls: 15.03(15.53)

Parkinson¡¯s Disease:

(Brown et al, 2005)

• Excellent reliability using original mean 5 point score: ICC = 0.83
• Excellent reliability using summed binary coded score: ICC = 0.82
• Adequate to excellent reliability for individual items: ICC = 0.52-0.72 (mean 0.63(0.06) for actual scores)

Parkinson¡¯s Disease:

(Brown et al, 2005)

• Excellent internal consistency (Cronbach¡¯s alpha = 0.98)
• Excellent internal consistencies with split half analysis (Cronbach¡¯s alpha = 0.90 and 0.92)

(Grace et al, 2007)

• Excellent split half reliability (0.93 and 0.95)
• Excellent internal consistency (Cronbach¡¯s alpha = 0.97)
• Inter-item correlations ranged from 0.44-0.87.
  • A few scale items were highly inter-correlated (> 0.85) with other items which suggests that some items my be redundant
  • Highly correlated items were 5 and 12 (r = 0.87); 7 and 9 (r = 0.85) and 11 and 13 (r = 0.85)

Parkinson¡¯s Disease:

(Brown et al, 2005)

• Excellent correlation with Rhoten Fatigue Scale (RFS) (ICC = 0.68)

(Grace et al, 2007)

• Excellent construct validity compared to the Fatigue Severity Scale (FSS) (r = 0.84, p < 0.001)
• Excellent construct validity compared to the Fatigue Rating (FR) (r = 0.78, p < 0.001)
• No significant correlations between the total scores on the PFS and disease severity as measured by the Hoehn and Yahr or the UPDRS motor subscale however specific statistics were not provided

Parkinson¡¯s Disease:

(Martinez-Martin et al, 2008)

• Floor effect: < 4%
• Ceiling effect: < 4%

Parkinson¡¯s Disease:

(Grace et al, 2007)

• Moderate effect size: n² = 0.24