Chronic Headache Education and Self-Management Study (CHESS): a process evaluation

BMC Neurology

Table 2 CHESS recruiting GP practices grouped by index of multiple deprivation deciles

*IMD	Number of practices	Patient Population of practices	Size of practices by patient population		identified at practices and contacted		interested		Interested & eligible	Eligible & consented		Eligible & randomised
Dec	N	Tot N	Median	IQR	N	%	N	%	N	%	N	%	N	%
1	16	125,898	7199	(5103, 9240)	2919	2	152	5	77	51	51	66	46	60
2	26	217,409	8732	(6343, 10,841)	5425	3	244	5	115	47	78	68	73	63
3	15	160,651	7852	(7232, 12,327)	2816	2	175	5	77	44	62	81	56	73
4	18	140,742	6629	(5377, 10,045)	2913	2	201	7	93	46	67	72	64	69
5	21	194,130	9250	(5582, 11,300)	3958	2	261	7	129	49	88	68	84	65
6	16	154,602	10,048	(5498, 12,515)	3169	2	230	7	102	44	70	69	64	63
7	9	58,016	4820	(3317, 9000)	1344	2	120	9	44	37	35	80	29	66
8	13	123,674	9474	(6821, 12,215)	2395	2	239	10	127	53	99	78	98	77
9	14	172,112	12,016	(7983, 16,465)	2483	1	248	10	122	49	99	81	93	76
10	16	176,452	11,809	(8225, 14,084)	3598	2	308	9	148	48	106	72	99	67
All	164	1,523,686	8979	(5760, 11,986)	31,020	2	2178	7	1034	47	755	73	706^a	68

*IMD Index of Multiple Deprivation. The deciles are calculated by ranking the 32,844 Lower-layer Super Output Area (LSOA) level in England from most deprived to least deprived and dividing them into 10 equal groups. LSOAs in decile 1 fall within the most deprived 10% of LSOAs nationally and LSOAs in decile 10 fall within the least deprived 10% of LSOAs nationally
^a 30 participants were self-referrals and not attached to a particular practice so are not included here

ISSN: 1471-2377