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. 2019 Aug 2;10:537. doi: 10.3389/fendo.2019.00537

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Copyright © 2019 Kumar, Voracek and Singh.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Line graph showing sex differences in palmar-to-dorsal digit ratios of digit 2 (Δ) and digit 4 (O), measured through the HT (__) and the HA (−−−) procedures. (i) Men have lower palmar-to-dorsal digit ratios than women, and this effect is stronger for digit 2 than for digit 4. (ii) The pattern of sex differences observed in digits 2 and 4 is similar for both (HT or HA) procedures. (iii) Digit ratios derived from the HT procedure are higher than those derived from the HA procedure, and, among both men and women, this effect is stronger for digit 2 than for digit 4.