Linkage of national soil quality measurements to primary care medical records in England and Wales: a new resource for investigating environmental impacts on human health

Table 1 Number of practices participating in the linkage between The Health Improvement Network database and the Geological Baseline Survey of the Environment, by Strategic Health Authority area

Strategic Health Authority	Participating practices	Active practices	Participation rate (%)
East Midlands	12	13	92
East of England	26	30	87
London	59	61	97
North East	12	13	92
North West	52	54	96
South Central	47	47	100
South East Coast	41	43	95
South West	45	46	98
Wales	36	39	92
West Midlands	40	40	100
Yorkshire & Humber	7	9	78
Total	377	395	95

ISSN: 1478-7954