Table 4. Results of the nested ANOVA comparing the mean size of Paracentrotus lividus between protection levels (reserve vs. non-reserve), habitat (boulders vs. vertical walls) and sites (nested within protection and habitat), over several years (1995 to 2005 and 2009–2010).
| df | MS | F | p | |
| Protection | 1 | 143.7 | 0.2096 | 0.670 |
| Habitat | 1 | 894.2 | 1.30 | 0.316 |
| Site (Protection*Habitat) | 4 | 1044.6 | 45.08 | 0.000 |
| Year | 12 | 123.2 | 6.45 | 0.000 |
| Protection * Habitat | 1 | 639.8 | 0.93 | 0.388 |
| Protection * Year | 12 | 39.0 | 2.04 | 0.037 |
| Habitat * Year | 12 | 72.5 | 3.79 | 0.000 |
| Site (Protection*Habitat) * Year | 48 | 32.0 | 12.11 | 0.000 |
| Protection * Habitat * Year | 12 | 15.2 | 0.79 | 0.651 |
| Error | 44162 | 2.6 |