Table 1.
Body mass, maximum reported life span, and longevity quotient of the species used in this study
| Species | Common Name/Strain | Mass, g | Age, mo | Maximum Life Span, yr | Longevity Quotient |
|---|---|---|---|---|---|
| Mus musculus | House mouse (C57BL/6) | 28 | 3 | ∼3.5 | 0.6 |
| Peromyscus leucopus | White-footed mouse | 21 | 3 | ∼8.2 | 1.5 |
The longevity quotient is the ratio of reported life span to that expected based on body mass predictions using the equation of Austad and Fisher (5) for nonvolant eutherian mammals (maximum life span = 10.67 Mkg0.189). The maximum life span for male Peromyscus leucopus is based on the published data of Sacher and Hart (48).