Table 1.

Number of CCGs, staged tumours per CCG, odds ratios over estimated underlying distribution of CCG performance, quartiles of the reliability of the complete-case early stage indicator, and the number of tumours and associated aggregated years of data for 50%, 70%, 90% and 100% of CCGs to have reliability of 0.7 or higher or of 0.9 or higher.

CCGs		209
Number of staged tumours per CCG	Minimum	125
	25th percentile	479
	Median	691
	75th percentile	943
	Maximum	3575
Odds ratio over CCG distribution*	75th/25th percentiles	1.16
	95th/5th percentiles	1.43
Reliability	Minimum	0.26
	25th percentile	0.58
	Median	0.66
	75th percentile	0.73
	Maximum	0.91
Number of tumours per CCG required for reliability 0.7	50% of units	803
	70% of units	812
	90% of units	833
	All units	926
Data years required for reliability 0.7	50% of units	1.2
	70% of units	1.5
	90% of units	2.3
	All units	6.6
Number of tumours per CCG required for reliability 0.9	50% of units	3095
	70% of units	3132
	90% of units	3210
	All units	3570
Data years required for reliability 0.9	50% of units	4.5
	70% of units	5.6
	90% of units	8.7
	All units	25.3

^*p < 0.0001. Odds ratio calculated directly from the estimated variance of the random intercept from the mixed-effects logistic regression (${\displaystyle \widehat{{\sigma }^2}}=$ 0.012) using the appropriate centiles of the standard normal distribution. The 75th/25th percentile odds ratio is calculated as $e^{\left(1.35\times \sqrt{0.012}\right)}$ and the 95th/5th percentile odds ratio is calculated as $e^{\left(3.29\times \sqrt{0.012}\right)}$.