TABLE 1. SMA slopes and associated statistics for frill and other skull traits from Protoceratops andrewsi.
| Measure | Intercept | Slope | Slope CIs | Test statistic | P slope ≠ 1 |
| Frill length | -1.46 | 1.23 | 1.14-1.34 | r = 0.719, 26df | <0.0001 |
| Frill width | -1.21 | 1.29 | 1.19-1.41 | r = 0.827, 18df | <0.0001 |
| Jugal Boss width | -0561 | 1.15 | 0.983-1.34 | r = 0.403, 18df | 0.078 |
| Orbit width | 0.272 | 0.699 | 0.650-0.751 | r = -0.877, 30df | <0.0001 |
| Orbit height | -0.583 | 0.843 | 0.760-0.935 | r = -0.526, 30df | 0.002 |
