Table 1.

Comparison of mortality (based on admissions with known outcomes), average annual numbers of procedures, and percentage changes from epoch 3 to epoch 6 for 11 defined procedure groups in all centres in England; data derived from hospital episode statistics

	Epoch 3, April 1991 to March 1995		Epoch 6 April, 1999 to March 2002		Percentage change from epoch 3 to epoch 6
Open procedure groups	Mortality (%)	Annual average No of procedures	Mortality (%)	Annual average No of procedures	Mortality (%)	Annual average No of procedures (%)
Tetralogy of Fallot	6.3	76	3.5	88	−45	+16
Interatrial transposition of great arteries	11.5	30	1.9	18	−84	−38
Other transposition of great arteries (switch)	11.9	160	3.4	129	−72	−20
Repair of total anomalous pulmonary venous drainage	15.6	51	6.8	50	−56	−2
Repair of atrial ventricular septal defect (complete not partial)	13.9	111	2.5	95	−82	−14
Closure of secundum and sinus venosus atrial septal defect	10.1	42	2.1	32	−80	−23
Closure of ventricular septal defect	5.2	230	1.4	260	−73	+13
Truncus arteriosus	33.7	27	9.8	17	−71	−36
Fontan type operations	18.0	31	1.6	61	−91	+94
Aortic, pulmonary valves, and paravalve procedures	10.4	67	6.4	54	−39	−19
Mitral valve procedures	25.5	15	16.3	15	−36	−1