Table 2.
Summary statistics for 2 independent ear-tagging experiments using pair-housed, female C57Bl/6J mice
| Experiment 1 |
Experiment 2 |
|||||
| Ear tagged (n = 33–36) | No procedure (n = 34–36) | Ear tagged (n = 85–100) | No procedure (n = 89–100) | |||
| Daytime motion | ||||||
| Maximal change (ratio) | 0.41 ± 0.09a | 0.79 ± 0.15 | 0.68 ± 0.24a | 0.82 ± 0.21 | ||
| Time (day) of maximal change | 1.61 ± 0.49 | not applicable | 1.38 ± 0.71 | not applicable | ||
| Nighttime motion | ||||||
| Maximal change (ratio) | 0.86 ± 0.08a | 0.96 ± 0.13 | 0.92 ± 0.11a | 0.97 ± 0.07 | ||
| Time (night) of maximal change | 1.00 ± 0.75 | not applicable | 0.51 ± 0.72 | not applicable | ||
| Breathing rate | ||||||
| Maximal change (ratio) | 0.88 ± 0.10a | 0.99 ± 0.12 | 1.10 ± 0.16a | 0.97 ± 0.22 | ||
| Time (day) of maximal change | 1.42 ± 0.66 | not applicable | 1.12 ± 0.80 | not applicable | ||
Data are given as mean ± 1 SD.
Experiment 1: daytime and nighttime motion ratios, n = 36 cages (Ear Tagged and No Procedure); breathing rate ratios, n = 33 cages (Ear Tagged) and n = 34 cages (No Procedure). Experiment 2: daytime and nighttime motion ratios, n = 100 cages (Ear Tagged and No Procedure); breathing rate ratios, n = 85 cages (Ear Tagged) and n = 89 cages (No Procedure).
a
P ≤ 0.05 (unpaired t test) compared with No Procedure.