Table 2.

Baseline comparison between treatment and placebo groups

Variable	HDM impermeable bedding, n = 26	Placebo bedding, n = 21
Age, mean (sd)	10.58 (2.34)	11.57 (2.08)
Males (%)	16 (62)	13 (62)
Peak expiratory flow in litres/min, mean (sd)	288.80 (100.80)	328.57 (73.02)
Number on inhaled steroids (%)	5 (19.2)	5 (23.8)
28-day asthma symptom score (0–336), median (inter-qaurtile range)	12.0 (6.5 to 52.5)	37.0 (9.0 to 69.0)
28-day rhinitis symptom score (0–252), median (inter-quartile range)	50.5 (19.8 to 82.5)	51.0 (23.5 to 84.5)
Episodes of night-time waking over 28 days, median (inter-quartile range)	0 (0 to 0.75)	0 (0 to 3.0)
28-day dose inhaled steroid mcg/month, median (inter-quartile range)	5600 (1450 to 11,100)	5400 (58 to 11,200)
28-day dose bronchodilator mcg/month, median (inter-quartile range)	800 (125 to 1700)	400 (100 to 42)