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It was a retrospective analysis, and patients were not randomized.
First, starting bids were not randomized due to the survey's administration as a paper survey.
Fifty-three of 287 patients were not randomized because all four risk factors were absent (low risk).
Therefore, this prospective study examined day surgery versus hospitalization surgery according to patient preference, and the patients were not randomized.
Another limitation of this study could have been in the recruiting bias as patients were not randomized into the two treatment groups.
The two series of patients were not randomized since the first series had been treated after 1990, whereas the second series had been treated before that date.
For example, students were not randomized to some peer cooperative learning groups that increased time on task or an equal time (relative to the prior teaching strategies).
Participants in the action and maintenance stage were not randomized to any of the interventions.
The experiments were not randomized.
Patient groups were not randomized.
Seven trials were not randomized or controlled.
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