Table 1. Item analyses of the 20 FACS items.
| Item | Min | Max | Mean | SD | Skewness | Kurtosis |
|---|---|---|---|---|---|---|
| Fatigue Scale | ||||||
| Q1: I felt fatigued | 0 | 100 | 48.49 | 29.56 | -0.02 | -1.21 |
| Q2: I felt alert* | 0 | 100 | 39.30 | 25.07 | 0.38 | -0.82 |
| Q6: I felt worn out | 0 | 100 | 53.22 | 30.59 | -0.22 | -1.16 |
| Q7: I felt sluggish | 0 | 100 | 43.80 | 30.20 | 0.16 | -1.24 |
| Q8: I felt run down | 0 | 100 | 44.78 | 30.84 | 0.08 | -1.28 |
| Q10: I had the energy to do what I wanted to do* | 0 | 100 | 49.14 | 27.97 | 0.06 | -1.14 |
| Q13: I had to force myself to get things done | 0 | 100 | 48.66 | 32.15 | -0.01 | -1.30 |
| Q15: I felt tired | 1 | 100 | 58.01 | 29.49 | -0.39 | -1.00 |
| Q17: I had to struggle to finish what I started to do | 0 | 100 | 38.83 | 31.71 | 0.43 | -1.17 |
| Q20: I had problems feeling energetic no matter if I slept or napped | 0 | 100 | 42.46 | 32.99 | 0.25 | -1.32 |
| Altered Cognition Scale | ||||||
| Q3: I lost track of what I was going to say | 0 | 100 | 41.45 | 30.16 | 0.31 | -1.16 |
| Q4: I was forgetful | 0 | 100 | 39.92 | 30.17 | 0.46 | -1.08 |
| Q5: I had trouble concentrating | 0 | 100 | 44.37 | 30.67 | 0.17 | -1.27 |
| Q9: I had trouble focusing on things I wanted to do | 0 | 100 | 42.16 | 30.90 | 0.24 | -1.23 |
| Q11: I was easily confused | 0 | 100 | 24.60 | 27.30 | 1.12 | 0.12 |
| Q12: I felt “spaced out” like I was in a fog | 0 | 100 | 30.66 | 30.49 | 0.78 | -0.70 |
| Q14: I was clear-headed* | 0 | 100 | 44.55 | 29.31 | 0.16 | -1.23 |
| Q16: I didn’t process things as quickly or accurately as I should have | 0 | 100 | 38.87 | 31.62 | 0.39 | -1.21 |
| Q18: I had trouble paying attention | 0 | 100 | 40.18 | 30.73 | 0.30 | -1.25 |
| Q19: It was hard for me to make up my mind and reach a decision | 0 | 100 | 34.53 | 31.74 | 0.61 | -0.98 |
Notes. Min, minimum value observed; Max, maximum value observed; SD, standard deviation.
*Reverse coded before conducting item analyses