Table 1. Practice characteristics used in the minimisation, stratified by Borough.

		Newham		Tower Hamlets
		Number of practices		Number of practices
		(N = 66)		(N = 39)
Minimisation variable	Categories	Intervention	Control	Intervention	Control
Number of	1	20	19	6	7
GP partners	2	8	6	5	7
	3+	6	7	6	8
Asthma	low (≤1)	10	10	5	5
admission	medium (>1 & ≤1.5)	16	14	5	8
rate	high (>1.5)	8	8	7	9
Per cent South Asian patients registered with practice	≤15%	8	11	4	6
	>15% to ≤30%	14	12	9	9
	>30%	12	9	4	7
Number of	≤ 600	21	20	10	10
South Asians	>600 & ≤1200	11	10	4	7
registered	>1200	2	2	3	5