Measurement of PEFR was done with a mini-Wright’s peak
flow meter (Clement Clarke International, UK). Prior to
recording the subjects’ PEFR, the use of the instrument was
repeatedly demonstrated and explained to them. The PEFR
test was performed in the standing position with the peak
flow meter held horizontally. The subjects were asked to take
as deep a breath as possible and then to blow out as hard and
as quickly as possible. The best of three ratings was recorded