| Sr. No | Duration of prolongation of pregnancy [hours] | NTG PATCH | |
| N | % | ||
| 1 | <48 | 01 | 02 |
| 2 | 48 - 72 | 04 | 08 |
| 3 | 72 - 96 | 02 | 04 |
| 4 | 96 - <7 days | 05 | 10 |
| 5 | >7 days | 38 | 76 |
| 6 | Mean Prolongation | 438.04 hours or 18.25 days | |