Longevity quotient (LQ) is a simplified measure to enable normalized comparisons of various species' longevity. LQ gives an indication of how long a species’ lifespan is compared with other species of similar size, where LQ = observed longevity/expected longevity. Mean longevity quotient allows to identify of long-lived species.
The Longevity Quotient is the ratio of actual maximum species life span (MLSP) to that predicted by body mass. It evaluates the manifestation of Peto's paradox in its evolutionary interpretation as the ability to grow for a long time and, accordingly, to age for a long time in different animals.
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