| Intervention group | Control group | ||||
---|---|---|---|---|---|---|
M | SD | p | M | SD | p | |
Assertion | ||||||
 T1 | 13.57 | 2.72 | 0.133 | 13.65 | 2.43 | 0.710 |
 T2 | 13.92 | 2.81 |  | 13.69 | 2.84 |  |
Self-control | ||||||
 T1 | 12.35 | 3.31 | 0.044 | 12.65 | 3.65 | 0.874 |
 T2 | 13.40 | 3.49 |  | 12.61 | 3.51 |  |
Cooperation | ||||||
 T1 | 9.38 | 5.98 |  <0 .001 | 9.40 | 4.14 | 0.778 |
 T2 | 11.04 | 5.80 |  | 9.19 | 5.99 |  |