Table 4. Year to year correlation coefficients (95% confidence interval) for detection rate and conversion rate from GP practices in England.

			Year to year correlation (95% confidence interval)a
Cancer Cases (per year)	Years	Practices	Detection rate	Conversion rate
N=6–25	2010 vs 2011	1353	0.21 (0.15 to 0.26)	0.60 (0.56 to 0.63)
	2011 vs 2012	1384	0.16 (0.11 to 0.22)	0.60 (0.56 to 0.64)
	2012 vs 2013	1401	0.16 (0.11 to 0.21)	0.60 (0.56 to 0.64)
N=26–50	2010 vs 2011	2416	0.28 (0.24 to 0.32)	0.48 (0.45 to 0.51)
	2011 vs 2012	2471	0.20 (0.16 to 0.24)	0.52 (0.49 to 0.55)
	2012 vs 2013	2443	0.22 (0.18 to 0.26)	0.53 (0.50 to 0.56)
N=51–75	2010 vs 2011	875	0.29 (0.23 to 0.35)	0.55 (0.50 to 0.59)
	2011 vs 2012	1008	0.22 (0.16 to 0.27)	0.50 (0.45 to 0.54)
	2012 vs 2013	1108	0.21 (0.15 to 0.26)	0.52 (0.47 to 0.56)
N>75	2010 vs 2011	250	0.33 (0.20 to 0.45)	0.58 (0.48 to 0.67)
	2011 vs 2012	316	0.29 (0.19 to 0.39)	0.55 (0.46 to 0.62)
	2012 vs 2013	394	0.35 (0.27 to 0.43)	0.63 (0.56 to 0.69)
All practices	2010 vs 2011	4894	0.26 (0.23 to 0.29)	0.53 (0.51 to 0.55)
	2011 vs 2012	5179	0.20 (0.17 to 0.22)	0.54 (0.52 to 0.57)
	2012 vs 2013	5346	0.21 (0.19 to 0.24)	0.55 (0.53 to 0.57)
All NHS Grampian	2006 vs 2007	38	0.26 (−0.07 to 0.55)	0.3 (−0.01 to 0.58)
	2007 vs 2008	41	0.47 (0.2 to 0.66)	0.48 (0.21 to 0.68)
	2008 vs 2009	62	0.25 (−0.01 to 0.42)	0.47 (0.27 to 0.61)
	2009 vs 2010	74	0.28 (0.09 to 0.44)	0.41 (0.16 to 0.61)
	2010 vs 2011	72	−0.01 (−0.24 to 0.21)	0.05 (−0.18 to 0.25)
	2011 vs 2012	73	0.1 (−0.11 to 0.33)	0.2 (−0.01 to 0.39)

^aSpearman rank correlation coefficient with bootstrapped 95% confidence intervals.