See Also: parasol insertion(medicine)
parasol(dictionary)
parasol(dictionary)
Herbal medicine (botanical medicine, herbology, phytomedicine)(health)
crossover(dictionary)
crossover(dictionary)
double crossover(medicine)
study, crossover(medicine)
crossover study(medicine)
Crossover rate(money)

crossover study (medicine) and parasol insertion (medicine)


crossover study (medicine)


crossover study
<statistics> A study that compares two or more treatments or interventions in which the subjects or patients, upon completion of the course of one treatment, are switched to another. Usually refers to a study in which the subject is switched from the experimental to the control procedure (or vice versa).

In the case of two treatments, a and b, half the subjects are randomly allocated to receive these in the order a, b and half to receive them in the order b, a.

A criticism of this design is that effects of the first treatment may carry over into the period when the second is given.

With this type of study, every patient serves as his or her own control.


parasol insertion (medicine)


parasol insertion -->
velamentous insertion


A form of insertion of the foetal blood vessels into the placenta, in which the vessels separate before reaching the placenta and develop toward it in a fold of amnion, somewhat like the ribs of an open parasol.

Synonym: parasol insertion.