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Table 2 Proportions of all patients ever registered at practices actively contributing data to The Health Improvement for whom partial (at least one element) or complete (all elements) soil measurements were obtained through linkage to the Geochemical Baseline Survey of the Environment (G-BASE)

From: 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

Strategic Health Authority Total patients at active practices Patients at linkage practices (% of total) Patients with partial G-BASE data (% of patients at linkage practices) Patients with complete G-BASE data (% of patients at linkage practices)
East Midlands 212,395 198,085 (93.3%) 190,681 (96.3%) 190,679 (96.3%)
East of England 574,828 474,517 (82.5%) 462,008 (97.4%) 462,005 (97.4%)
London 1,208,044 1,190,099 (98.5%) 1,000,246 (84.0%) 1,000,232 (84.0%)
North East 218,821 208,238 (95.2%) 175,302 (84.2%) 175,301 (84.2%)
North West 767,722 733,446 (95.5%) 660,898 (90.1%) 656,475 (89.5%)
South Central 1,069,029 1,069,029 (100.0%) 1,040,055 (97.3%) 1,035,340 (96.8%)
South East Coast 873,765 845,650 (96.8%) 804,428 (95.1%) 804,367 (95.1%)
South West 763,658 752,735 (98.6%) 706,818 (93.9%) 706,817 (93.9%)
Wales 564,190 503,432 (89.2%) 485,619 (96.5%) 451,544 (89.7%)
West Midlands 716,592 716,592 (100.0%) 662,649 (92.5%) 633,347 (88.4%)
Yorkshire & Humber 168,321 133,559 (79.3%) 131,448 (98.4%) 127,256 (95.3%)
Total 7,137,365 6,825,382 (95.6%) 6,320,152 (92.6%) 6,243,363 (91.5%)