Table 1.

Patient and practice demographics

Demographic variable	Group	Frequency	Percentage (%)
Gender	Males	2 871 884	48.03
	Females	3 107 562	51.97
	Other/unknown	152	0.00
Age (in 2015)	16–44	2 684 443	44.89
	>44	3 295 155	55.11
Ethnicity	Asian	147 295	2.46
	Black African	45 632	0.76
	Black Caribbean	28 558	0.48
	Other	118 934	1.99
	White	3 328 189	55.66
	Unknown	2 310 990	38.65
Region	Outside London	4 693 116	78.49
	London	1 129 924	18.90
	Unknown	156 558	2.62
Urban/rural	Urban (conurbation)	2 134 497	35.70
	Urban (city/town)	2 991 079	50.02
	Rural	697 452	11.66
	Unknown	156 558	2.62
Patient IMD (2015) 1=least deprived, …, 5=most deprived	Quintile 1	1 285 213	21.49
	Quintiles 2,3,4	3 564 936	59.62
	Quintile 5	964 853	16.14
	Unknown	164 596	2.75
Practice IMD (2015) 1=least deprived, …, 5=most deprived	Quintile 1	1 249 293	20.89
	Quintiles 2,3,4	3 702 313	61.92
	Quintile 5	871 434	14.57
	Unknown	156 558	2.62

IMD, Index of Multiple Deprivation.