Clinical correlation between erectile function and ejaculatory function in the Czech male population

Introduction
The objective of this study is to determine whether there is any relationship between erectile function (EF) and ejaculatory function (EJF), with the aim of improving care protocols in the clinical practice.

Materials and methods
A total of 1004 Czech males between 15 and 84 years (42.77 ± 17.556 years) completed a sexual behavior questionnaire. A correlational, between-subjects design was used, where a 5-item abbreviated form of the International Index of Erectile Function (IIEF-5) was used to measure EF, which produces a value between 5 and 25. Values greater than 21 are considered as a normal function. EJF was measured using the Index of Premature Ejaculation (IPE). IPE has three domains (Control, Satisfaction and Distress) with scores from 0 to 100, higher ones are associated with a greater control and satisfaction, and lower anxiety, all related to the perception of ejaculation. A linear regression analysis was performed and a statistics model was proposed for each domain with EF as a dependent variable and the specific EF domain as a predictor. The Pearson correlation coefficient was also calculated for these variables.

Results
EF scale mean value was 19,44 ± 2,368, control domain mean value was 80,98 ± 18,032; sexual satisfaction domain mean value was 78,07 ± 21,454; and distress domain mean value was 74,85 ± 34,498.
The results indicate that all linear regression models between EF and each of the domain of EJF and the Pearson coefficients (r) are statistically significant (p<0.05). Control r=0,478, p=.001, Satisfaction r=0,405, p=.001 and Distress r=0,324, p=.002.

Conclusions
Higher levels of EF are associated with a better control and sexual satisfaction, and less distress about ejaculation. This link should be considered for developing new clinical practice guidelines for erectile dysfunction and premature ejaculation.

引言
本研究旨在探讨勃起功能（Erectile Function, EF）与射精功能（Ejaculatory Function, EJF）之间的相关性，以期优化临床实践中的诊疗方案。

材料与方法
本研究共纳入1004名年龄介于15至84岁的捷克男性（平均年龄42.77±17.556岁），所有受试者均填写了性行为调查问卷。本研究采用相关性研究的被试间设计，使用勃起功能国际指数简表（5条目版，International Index of Erectile Function-5, IIEF-5）评估勃起功能（EF），该量表得分区间为5至25分，得分高于21分提示勃起功能正常。采用早泄指数（Index of Premature Ejaculation, IPE）评估射精功能（EJF），IPE包含控制度、满意度与困扰感三个维度，得分范围为0至100分，得分越高提示射精控制能力与性满意度越好，焦虑程度越低，所有维度均与射精感知相关。本研究开展了线性回归分析，以EF为因变量，各射精功能维度为预测变量，针对每个维度分别构建统计模型；同时计算了上述变量间的Pearson相关系数。

结果
勃起功能量表平均得分为19.44±2.368，射精控制维度平均得分为80.98±18.032，性满意度维度平均得分为78.07±21.454，困扰感维度平均得分为74.85±34.498。
结果显示，勃起功能与射精功能各维度间的所有线性回归模型，以及各Pearson相关系数（r）均具有统计学意义（p<0.05）。其中控制维度r=0.478，p=0.001；满意度维度r=0.405，p=0.001；困扰感维度r=0.324，p=0.002。

结论
勃起功能水平越高，射精控制能力与性满意度越好，射精相关困扰程度越低。该关联可为勃起功能障碍与早泄的临床实践指南制定提供参考依据。