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BJUI has complete an in depth study of penis size. You can finally see just how small your penis really is compared to real men.   Results
Nomograms for flaccid pendulous [n = 10 704, mean (sd) 9.16 (1.57) cm] and stretched length [n = 14 160, mean (sd) 13.24 (1.89) cm], erect length [n = 692, mean (sd) 13.12 (1.66) cm], flaccid circumference [n = 9407, mean (sd) 9.31 (0.90) cm], and erect circumference [n = 381, mean (sd) 11.66 (1.10) cm] were constructed. Consistent and strongest significant correlation was between flaccid stretched or erect length and height, which ranged from r = 0.2 to 0.6. Limitations: relatively few erect measurements were conducted in a clinical setting and the greatest variability between studies was seen with flaccid stretched length.Correlation with Somatometric Parameters
Several papers investigated the relationship between penile dimensions and somatometric parameters. The main findings are summarised below.
Height and flaccid length
One study [7] found flaccid length to be moderately significantly correlated with height (r = 0.32) and three studies [10, 21, 22] found weak correlations (r = 0.19–0.2). However, two studies [8, 21] reported no significant correlation between flaccid length and height.
Height and stretched flaccid or erect length
Aslan et al. [7] found height to be moderately significantly correlated with stretched length (r = 0.61); four studies [10, 12, 22, 23] found a weak correlation with erect or stretched length (range r = 0.21–0.31).
Flaccid length and weight or body mass index (BMI)
One study [7] found a moderately significant correlation between flaccid length and weight (r = 0.40) and BMI (r = 0.39) and one [12] found a weak significant correlation (weight r = 0.21 and BMI r = 0.24). One study [21] found no correlation between penile length and weight or BMI. Lastly, one study [10] found a weak inverse significant correlation (r = −0.14 and −0.24).
Erect or stretched flaccid length and weight or BMI
One study [12] found erect length to be weakly significantly correlated with BMI (r = 0.24). Two studies [7, 12] found weak significant correlations between flaccid stretched length and weight or BMI (r = 0.21 and 0.27). One study [21] found no correlation between penile length and weight or BMI. However, one study [10] found stretched length to have a significantly weak inverse correlation with weight and BMI (r = −0.14 and −0.17).
Digit ratio
One study [23] found a weak significant correlation between penile length and index finger length (r = 0.23), whilst one study did not [21]. However, the latter found a significantly weak inverse correlation between stretched penile length and the ratio between the length of second to fourth digit (r = −0.22).
Testicular volume
One study [7] found a weak significant correlation (r = 0.14) between testicular volume and flaccid and stretched penile length whereas one did not [24].
Foot size
One study [22] found stretched length to be significantly weakly correlated with foot size (r = 0.27) and one study [29] did not find a correlation between penile length and foot size.
Age
Seven studies [5, 7-9, 21, 22, 24] found no significant correlation between age and penile size. Two studies [13, 23] reported that age was weakly positively correlated with flaccid circumference (r = 0.05 and 0.19, respectively) but not flaccid length. Schneider et al. [25] found a small group of younger men (aged 18–19 years) to be significantly smaller in their flaccid length and erect circumference but not erect length compared with a group of men aged 40–68 years.
Summary
All the correlations between penile dimensions and somatometric parameters were either inconsistent or weak. The most consistent and strongest significant correlation was between flaccid stretched or erect length and height, which was found in four studies and ranged from r = 0.21 to 0.31 and in one study was 0.61.http://onlinelibrary.wiley.com/doi/10.1111/bju.13010/abstract
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