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The significance test of slope difference.
| Simple slop | B | SE |
| (1) VS (2) | −0.205** | 0.076 |
| (1) VS (3) | −0.318* | 0.126 |
| (1) VS (4) | −0.246** | 0.089 |
| (2) VS (3) | −0.113 | 0.135 |
| (2) VS (4) | −0.041 | 0.092 |
| (3) VS (4) | 0.072 | 0.097 |
*represents p < 0.05; **represents p < 0.01.
