| Methods | N | 2M | 4M | 6M | |||
---|---|---|---|---|---|---|---|---|
Mean | SE | Mean | SE | Mean | SE | |||
High | Loading | 9 | 39.58 | 0.82 | 44.25 | 0.76 | 45.51 | 1.43 |
 | Unloading | 9 | 40.37 | 1.16 | 43.64 | 3.47 | 46.04 | 2.26 |
Medium | Loading | 9 | 41.69 | 1.13 | 28.93 | 1.55 | 22.55 | 0.99 |
 | Unloading | 9 | 41.88 | 1.55 | 31.40 | 3.92 | 26.27 | 4.53 |
Low | Loading | 9 | 23.80 | 1.81 | 18.28 | 0.93 | 18.46 | 1.02 |
 | Unloading | 9 | 21.70 | 5.75 | 17.97 | 2.14 | 16.26 | 0.86 |