Income level and regional policies, underlying factors associated with unwarranted variations in conservative breast cancer surgery in Spain

Table 2 Conservative and non conservative breast cancer surgical rates

	Less than 50 years			50 to 70 years			More than 70 years			All ages
	CS	NCS	Total	CS	NCS	Total	CS	NCS	Total	CS	NCS	Total
Cases	11,821	9,646	21,251	23,204	14,676	35,523	9,623	13,745	23,094	44,648	38,067	81,868
Population	47,728,827			19,931,718			13,945,734			81,606,279
Standardized rate	2.40	2.05	4.41	11.13	7.69	18.67	6.81	10.30	16.91	5.29	4.84	10.03
RV _5-95	4.17	2.76	2.45	3.97	2.98	2.32	7.16	2.909	2.50	3.92	2.51	2.05
SCV	0.141	0.042	0.046	0.148	0.108	0.062	0.236	0.122	0.083	0.153	0.080	0.057
Empirical Bayes	0.149	0.064	0.048	0.182	0.101	0.061	0.272	0.091	0.067	0.191	0.078	0.059

2002-2006 age-sex standardized rates and statistics of variation
CS: Conservative surgery; NCS: Non-conservative Surgery. RV_5-95: Represents the range of variation in standardized rates, between the areas in percentiles 95^th and 5^th, expressed as a ratio. Systematic Component of Variation (SCV)) and Empirical Bayes Statistic (EB) represent the variation considered systematic (thus, beyond chance). Both are estimated using observed and expected cases; the latter obtained by indirect standardization.
EB uses Bayesian modelling and simulation, resulting in a more robust estimate for small numbers [15].

ISSN: 1471-2407