Abstract Introduction Erect penis length plays an important role in the sexual confidence and sexual life of men. However, there was some difficulty in measuring the exact erection length while doing the clinical examination. Men who come for examination at our hospital in Vietnam are diverse in ages, geographical areas, and occupations. Clinical examination of male genitalia includes the penis and testicles as the two most important components. During the penile examination, assessment of the patient’s penis length at the time of examination reflects characteristics related to fertility and sexual function and contributes to diagnosis and prognosis. Moreover, there have not been many studies on penis size that fully evaluate measurements of flaccid, stretched, and erection. There were some studies about the average erect penile length in Europe and America, but there are have been no study studies in Vietnamese in recent years. In clinical practice, we also use stretch penile length to evaluate the erection length indirectly, but is there a correlation between them in the Asian men group or our report Vietnamese men? Objective To determine the correlation between penile length measured when stretched and erection. Methods Three hundred eight men who visited our hospital in Hanoi, Viet Nam were involved in our study between December 2022 and December 2023. The age, geographical areas, and occupations of the subjects were recorded. Penile measurements (flaccid, erect length, stretched length) were predominantly taken by one investigator using a tape measure and the same measurement technique. STATA version 17.0 was used for statistical evaluation of the results. Results were evaluated using descriptive statistics and Pearson correlation analysis between penile flaccid, erect length, stretched length parameters, p value less than 0.05 was considered significant. Results The mean age of the subjects was 28 (range: 15-55) years. Men from big urban areas (Ha Noi, Hai Phong, Ho Chi Minh City) had the most visits (29,9%). Nearly 3% of participants had circumcision. It accounted for 55,2% of freelancers and businessmen who were consulted. The mean penile length in flaccid, stretched and erection states were 9.41 ± 1.75 cm, 12.75 ± 1.73 cm, and 13.43 ± 1.53 cm, respectively. Mean penile length were not significantly different between ages, geographical area, and occupation (p > 0.05). There was a positive correlation between stretch length and erection length (r = 0.73, p < 0.05); with the equation of erect length = 13.34 + 0.01x stretched length. Conclusions Our study provides fully evaluate measurements of flaccid, stretched, and erection in Vietnamese men and there was a positive correlation between stretch length and erection length. So we suggest using stretch penile length to evaluate erection length in our clinical practice. Disclosure No.
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