The phrase "a true control group" is correct and usable in written English.
It can be used in scientific or research contexts when discussing the validity of a control group in an experiment.
Example: "In our study, we ensured that we had a true control group to accurately measure the effects of the treatment."
Alternatives: "an actual control group" or "a genuine control group".
Furthermore, like in most randomized controlled studies applying life style intervention, the control group is not a true control group since they also received general information about a healthy lifestyle.
This experimental research using a true control group pretest posttest design was conducted with 120 youths from three communities selected through purposive sampling from those with the lowest and highest scores for an Islamic Behavior Test.
The study employed a true control group pretest and posttest design and the data-collecting instrument was a screening questionnaire for domestic violence risk behaviors among Thai Muslim married couples.
A fourth limitation is the absence of a true control group in which CEUS was not performed, as our results were obtained by comparing a real group in which CEUS was performed with a hypothetical one in which CEUS was not performed.
Many studies of yoga and sexuality are fraught with design errors including small sample sizes, lack of randomization, or absence of a true control group of people who are not in yoga classes.
So the added 12 subjects were not a true control group of unexposed and uninfected subjects.
The lack of a true control-group in step-2 can result in difficulties to interpret the effects of the stress-intervention.
First, it was a retrospective study based on a prospectively collected database and had no true control group.
Even as a single blinded randomised clinical trial there is no true control group, and we cannot state whether true a cause-and-effect relationship exists.
A potential limitation of this study is that there was no true control group and that those receiving UC still received an intervention, although this was less intensive compared with the NI.
The true control group, to whom the elite Kenyans should be compared, however, is a group of performance matched athletes from Europe, or America, or perhaps even Ethiopia/Uganda/Eritrea.
