Fluticasone propionate: an audit of outcomes and cost-effectiveness in primary care.

Study sample No method of subject selection was stated other than that those included were registered asthmatics at the authors' practice, and that they were first prescribed FP in 1993 (FP group) or 1994 (control group). No power calculations were stated in the determination of the study sample size. Group sizes were: 21 (FP first prescribed in 1993) and 24 (FP first prescribed in 1994). The second group of FP recipients was chosen in order to control for non-drug effects during the study (i.e. changes in clinical procedures or practice staff). No exclusions or refusals to participate were reported.