Items | 2009 (n = 18) | 2010 (n = 28) | 2011 (n = 12) | Mean value | P |
Inner diameter/cm | 38.8 ± 2.4 | 37.4 ± 2.2 | 37.4 ± 1.8 | 37.8 ± 3.0 | 0.079 |
Depth of nest/cm | 10.0 ± 1.9 | 9.1 ± 1.9 | 9.0 ± 1.3 | 9.4 ± 1.8 | 0.198 |
Distance between nests/cm | 81.5 ± 8.2 | 78.9 ± 16.9 | 75.9 ± 10.4 | 79.1 ± 13.4 | 0.546 |