Table 2.
Proportion of mouse–days with new wounds by type of enrichment
| No. of mouse-days with new wounds / total no. of mouse-days | Proportion (95% CI) | Pairwise Pa | |
| Cotton squares (control) | 89 / 835 | 0.107 (0.086–0.128) | — |
| Nylon bones | 89 / 948 | 0.094 (0.075–0.112) | 0.372 |
| Mouse house and wheel | 140 / 1480 | 0.095 (0.080–0.110) | 0.353 |
| Paper rolls | 69 / 862 | 0.080 (0.062–0.098) | 0.060 |
| Shredded paper | 75 / 674 | 0.111 (0.088–0.135) | 0.771 |
The number of mouse-days was defined as the sum of the follow-up days for all mice in a group.
a
From χ2 test for association. Overall P = 0.2412.