Table 4.

Spearman's rank correlation between dementia diagnosis rates divided into quartiles and prescription costs

Years	Quartile (lowest to highest diagnosis rates)	Number of PCTs* in each group	Mean NIC (SD) per person on dementia register	Correlation between NIC and diagnosis rate	p Value
2009–2010	1st	37	303.4 (177.3)	0.533	0.001
	2nd	38	357.0 (131.5)	0.571	<0.001
	3rd	38	317.0 (166.5)	0.655	<0.001
	4th	37	333.8 (136.2)	0.684	<0.001
2010–2011	1st	37	329.5 (163.6)	0.497	0.002
	2nd	38	328.9 (176.5)	0.604	<0.001
	3rd	38	302.0 (164.6)	0.644	<0.001
	4th	37	358.5 (127.1)	0.764	<0.001
2011–2012	1st	37	331.4 (185.8)	0.384	0.019
	2nd	38	360.4 (167.4)	0.742	<0.001
	3rd	38	337.3 (177.3)	0.548	<0.001
	4th	37	379.3 (136.4)	0.717	<0.001

*NIC, net ingredient cost; PCT, primary care trust.