Definitely a poor design on the study. The lack of a control group really weakens the credibility of the results. The size of the treatment group (52) isn´t exactly impressive either..., but consistent results of all but 6 of them does point to a certain effect.
Though it´s really hard to evaluate the degree of those results without a control group.
Though it´s really hard to evaluate the degree of those results without a control group.
