Table 3.

Comparability of practitioners and practices

	Intervention	Control	p-value
	(21 practices)	(22 practices)
Up to 10 years since physician registered	9	1	0.1*
11–20 years since registration	11	9
More than 20 years since registration	12	13
Male physicians	24	21	0.17†
Female physicians	8	2
0 – 5 children with asthma in practice	12	14	0.76†
>5 children with asthma in practice	9	8

*Chi square = 5.3

^†Fisher's exact test