| Item | 2012 | 2013 | 2014 | pvalue† | |
| Mean ± SD/n (%) | |||||
| physical fatigue | 10.31 ± 2.95 | 8.56 ± 2.43 | 9.31 ± 2.82 | 0.004 | |
| mental fatigue | 12.34 ± 3.18 | 9.12 ± 3.71 | 10.57 ± 3.05 | 0.009 | |
| comprehensive fatigue | 22.83 ± 6.17 | 17.92 ± 5.47 | 19.34 ± 6.92 | 0.012 | |
| Comprehensive evaluation | good | 6 (46.2) | 8 (61.5) | 7 (53.8) | 0.032 |
| attention | 4 (23.1) | 4 (30.8) | 3 (23.1) | ||
| careful | 3 (23.1) | 1 (7.7) | 3 (23.1) | ||
| Item |
| 2012 vs 2013 | 2013 vs 2014 | 2012 vs 2014 | |
| Pair-wise comparison: p valueα | |||||
| physical fatigue | 0.001 | 0.006 | 0.005 | ||
| mental fatigue | 0.001 | 0.002 | 0.003 | ||
| comprehensive fatigue | 0.008 | 0.009 | 0.006 | ||