The intermembral index is used frequently in primatology, since it helps predict primate locomotor patterns.
For scores lower than 100, the forelimbs are shorter than the hind limbs, which is common in leaping primates and bipedal hominids.
This information can also be used to predict locomotion patterns for extinct primates in cases where forelimb and hind limb fossils have been found.
[1] In a diverse ethnic sample of 314 modern human skeletons covering African Pygmies, Andaman Islanders, Khoesan, Zulu, African Americans, Sami and Inuit the intermembral index was found to vary between 64 and 74.
[5] Variation has also beem found in chimapanzees (100.1 - 113.7), gorillas (110.3 - 125.0), orangutan (135.0 -150.9), siamang (145.0 - 155.2), gibbon (120.5 - 137.1), and macque monkeys (83.0 - 91.0).