In which group of females is non-truncal reflux more prevalent?

Non-truncal reflux is more prevalent in multiparous women, particularly those who have had more than three pregnancies. This is largely due to the physiological changes that occur during pregnancy, such as increased blood volume and hormonal changes, which can lead to venous dilation and changes in the hemodynamics of the lower extremities. The repeated stress of pregnancies can also contribute to weakening of the venous walls, making them more susceptible to reflux.

In contrast, nulliparous women, those who have never been pregnant, are less likely to experience the same degree of venous changes since they have not undergone the repeated physiological demands placed on the body during multiple pregnancies. Singles and teenagers are less affected by these conditions, as they typically have not experienced the vascular changes associated with childbirth. Thus, the prevalence of non-truncal reflux is significantly heightened in multiparous women compared to other groups.