Table 1.
Summary statistics for 2 independent tail-tattooing experiments using pair-housed, female C57Bl/6J mice
| Experiment 1 |
Experiment 2 |
|||||
| Tattooed (n = 87–117) | No procedure (n = 44–56) | Tattooed (n = 24–27) | No procedure (n = 25–27) | |||
| Daytime motion | ||||||
| Maximal change (ratio) | 0.67 ± 0.23a | 0.84 ± 0.20 | 0.59 ± 0.13a | 0.79 ± 0.15 | ||
| Time (day) of maximal change | 1.57 ± 0.62 | not applicable | 0.96 ± 0.82 | not applicable | ||
| Nighttime motion | ||||||
| Maximal change (ratio) | 0.87 ± 0.10a | 1.02 ± 0.07 | 0.84 ± 0.10a | 0.92 ± 0.13 | ||
| Time (night) of maximal change | 0.54 ± 0.75 | not applicable | 0.27 ± 0.57 | not applicable | ||
| Breathing rate | ||||||
| Maximal change (ratio) | 1.23 ± 0.47a | 1.04 ± 0.14 | 1.18 ± 0.36 | 1.12 ± 0.23 | ||
| Time (day) of maximal change | 0.87 ± 0.71 | not applicable | 1.09 ± 0.87 | not applicable | ||
Data are given as mean ± 1 SD. Experiment 1: daytime and nighttime motion ratios, n = 117 cages (Tattoo) and n = 56 cages (No Procedure); breathing rate ratios, n = 87 cages (Tattoo) and n = 44 cages (No Procedure). Experiment 2: daytime and nighttime motion ratios, n = 27 cages (Tattoo and No Procedure); breathing rate ratios, n = 24 cages (Tattoo) and n = 25 cages (No Procedure).
a
P ≤ 0.05 (unpaired t test) compared with No Procedure.