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This result is consistent with the previous studies by Wu, who found significant difference in the digit ratio between men and women only for the right hand in the control group (P < 0.001) [22].
We have previously shown that there is no sex difference in the digit ratios of inbred mice, but found behavioral evidence to suggest that higher 2D∶4D is associated with more masculinized behaviors.
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Here we examine the sex and strain differences in the digit ratios of 20 inbred mice strains to establish the relationship between digit ratio on the four paws with respect to sex and strain.
This will be true in general, and more formally, the linear regression model The difference in the last digit of Total SS between the ANOVA and regression analysis is due to rounding error.
The sex differences found in the digit ratios of adult birds were not yet apparent in fledgling birds or in the captive birds several months after fledging while reaching full independence.
No sex differences were found in the digit ratios of the captive adult birds from the androgen manipulation experiment (Table 2).
To further rule out action tremor as a potential contributor to the above group differences in digit placement, we tested the difference in each digit contact point (a) variability and (b) modulation to object CM between patients with no vs. mild action tremor (3 vs. 6 patients, respectively).
Investigation of the differences in the ten-digit codes generated by either visual interpretation or the BBL Crystal autoreader, revealed no obvious bias in either method.
Although the investigated sample was not large, the results suggest that the effect of the difference in digit ratio between males and females in Black populations can be at least as strong as in White populations.
Thus, the soft tissues at the fingertips were not the significant contributors to the sex difference in digit ratio.
Even with that evidence, the difference in digit length in adults may well reflect environmental factors or even difference in dexterity or pattern of hand usage amongst the individuals.
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