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Lookup NU author(s): Dr Gareth Richards,
Dr Trevor James
This is the authors' accepted manuscript of an article that has been published in its final definitive form by Taylor and Francis, 2019.
For re-use rights please refer to the publisher's terms and conditions.
The largest investigation of digit ratio (2D:4D), the BBC Internet Study, reported on finger lengths measured by participants themselves, yet data validating this technique are scarce and the reliability has been questioned. The current study aimed to calculate reliability and repeatability statistics for self-measured 2D:4D, and to examine the correlations with researcher-measures. 178 undergraduate psychology students attending a practical class self-measured their finger lengths with rulers; a researcher using digital Vernier callipers measured the second and fourth fingers of a random subsample (n=97). Reliability and repeatability of self-measured 2D:4D were high, as were correlations with researcher-measurements. In each case, lower values were observed for the right-left difference in 2D:4D (D[R-L]). Self-measured L2D:4D and M2D:4D were significantly higher than the equivalent researcher measurements, suggesting that direct comparison could be problematic. Self-measurements and directly made researcher-measurements of 2D:4D are strongly correlated, though self-measured D[R-L] is unreliable.
Author(s): Richards G, James TK
Publication type: Article
Publication status: Published
Journal: Annals of Human Biology
Online publication date: 02/10/2019
Acceptance date: 28/08/2019
Date deposited: 03/09/2019
ISSN (print): 0301-4460
ISSN (electronic): 1464-5033
Publisher: Taylor and Francis
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