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Change in specific procedures across eras (fig 2): χ2 cells
| Era 1 | Era 2 | Era 3 | |
| SASD | 1.732 | 1.894 | 7.251 |
| LVOT | 0.711 | 0.409 | 0.038 |
| PVR | 7.995 | 1.668 | 16.900 |
| Conduit | 1.712 | 1.844 | 7.111 |
| Aortic | 0.014 | 0.028 | 0.083 |
| PA banding | 2.054 | 0.283 | 3.843 |
| Fontan | 0.563 | 1.264 | 3.521 |
| Ross | 2.520 | 0.088 | 1.641 |
χ2 = 65.169 with df = 14.
χ2 p<0.0001.
LVOT, left ventricular outflow tract; PA, pulmonary artery; PVR, pulmonary valve replacement; SASD, secundum atrial septal defect.
