Average duration of recurrence | Frequency | Percent |
Within two weeks | 2 | 0.2 |
One month | 6 | 0.6 |
Two months | 80 | 8.3 |
Three months | 26 | 2.7 |
Six months | 6 | 0.6 |
One year | 20 | 2.1 |
Two years | 19 | 2.0 |
Missing | 810 | 83.6 |
Total | 969 | 100 |