Comparisons of the annual failure rates of minimal invasive surgical ventricular septal defect closure over the 5-year period from 2015 to 2019
| Year | Total patients (n=522) | Success | Failure | t-statistic | P value | ||
| Patients (n=503) | Percentage (%) | Patients (n=19) | Percentage (%) | ||||
| 2015 | 81 | 79 | 97.53 | 2 | 2.47 | 0.11 | <0.01 |
| 2016 | 109 | 105 | 96.33 | 4 | 3.67 | ||
| 2017 | 104 | 98 | 94.23 | 6 | 5.77 | ||
| 2018 | 101 | 97 | 96.04 | 4 | 3.96 | ||
| 2019 | 127 | 124 | 97.64 | 3 | 2.36 | ||
| Total | 522 | 503 | 96.36 | 19 | 3.64 | ||