Informed consent: II. Withdrawal-without-prejudice clauses may increase no-shows.
Undergraduate volunteers (N = 132) were either informed of the withdrawal-without-prejudice clause immediately prior to testing or at the time of recruitment several days earlier. Of those informed of the withdrawal clause at recruitment, 50% failed to attend the study session, whereas only 27% of those who were not informed of the clause until the time of the appointment failed to keep the appointment. Performance on a test designed to measure persistence was not affected. No-shows had a more external locus of control over academic matters and lower grade point averages than did appointment keepers.
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