Table 7.
Change in the complexity of lesions across eras (fig 1): χ2 cells
| Era 1 | Era 2 | Era 3 | |
| Simple | 2.345 | 0.211 | 4.312 |
| Moderate | 1.423 | 0.367 | 3.511 |
| Complex | 0.246 | 0.011 | 0.169 |
χ2 = 12.595 with df = 4.
χ2 p = 0.0134.
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