| Item | 2012 | 2013 | 2014 | p value† |
| mean ± SD | ||||
| DA | 1.7 ± 0.7 | 1.5 ± 0.8 | 1.6 ± 0.5 | 0.042 |
| TST (Minute) | 470.2 ± 58.1 | 426.7 ± 63.1 | 446.9 ± 52.6 | 0.037 |
| SE (%) | 91.9 ± 4.3 | 94.8 ± 2.9 | 93.1 ± 3.8 | 0.038 |
| Aw (Times) | 10.4 ± 4.6 | 6.5 ± 3.8 | 8.2 ± 3.1 | 0.023 |
| Naps (Times) | 9.2 ± 4.9 | 5.4 ± 3.3 | 6.1 ± 3.6 | 0.014 |
| Item | 2012 vs 2013 | 2013 vs 2014 | 2012 vs 2014 | |
| Pair-wise comparison: p valueα | ||||
| DA | 0.015 | 0.021 | 0.019 | |
| TST (Minute) | 0.005 | 0.016 | 0.016 | |
| SE (%) | 0.011 | 0.017 | 0.018 | |
| Aw (Times) | 0.008 | 0.019 | 0.054 | |
| Naps (Times) | 0.005 | 0.011 | 0.007 | |