Gestation length [days] in nonhuman primates as provided in Sacher & Staffeldt [32] compared to more recent values, for which conceptions were determined based on hormonal analysis or other physiological measures.

A proportion of less than 1.0 indicates that – compared to Sacher & Staffeldt [32] – gestation length is now considered to be shorter in the respective species. A value over 1.0 indicates the opposite. Bold, underlined = current value 1.1 or more; bold italic = current value 0.9 or less. Note also that since 1974 gestation length has been determined for many more than these 15 species.
1Species names standardized according to Groves [107].
2Identical values in Sacher & Staffeldt [32] for two species.
3The two values in Sacher & Staffeldt [32] were averaged.
4Value for a closely related species of similar body mass, wild Trachypithecus phayrei.