Table 2. Number of hospitals meeting the measure of ‘outcome-only’ (better than substandard), of ‘volume-only’ (50 procedures or more), or the combined measure of volume and outcome’ in 2010, using different thresholds for ‘substandard care’.

Quality measure		Outcome only	Volume only	Combined measure of volume and outcome
Outcome measure	Threshold for substandard care	O/E < =  substandard (%)	N > = 50 (%)	Not worse than average: CI95min <  = 1 (%)	Better than substandard: CI95max < threshold (%)	Both (%)
	O/E<1.5	71 (80)			13 (15)	13 (15)
Mortality	O/E<2	82 (92)	80 (90)	84 (94)	21 (24)	21 (24)
	O/E<3	87 (98)			59 (66)	56 (63)
	O/E<1.5	84 (94)			47 (53)	42 (47)
Morbidity	O/E<2	89 (100)	80 (90)	81 (90)	77 (87)	74 (83)
	O/E<3	89 (100)			89 (100)	81 (90)

N =  number of patients.

O/E =  Observed/Expected outcome ratio.

CI95min  =  Lower limit of 95% confidence interval around the O/E ratio.

CI95max  =  Upper limit of 95% confidence interval around the O/E ratio.