PMA (in weeks) of the infants in both IVR and IVB groups at time of interventions
| Bevacizumab | Ranibizumab | P value | |||||||
| Mean | SD | Minimum | Maximum | Mean | SD | Minimum | Maximum | ||
| PMA at initial injection | 37.00 | 1.97 | 33.00 | 41.00 | 37.00 | 1.97 | 33.00 | 41.00 | 1.000 |
| PMA at time of rescue injection | 40.75 | 5.25 | 36.00 | 48.00 | 48.00 | 0 | 48.00 | 48.00 | 0.305 |
| PMA when maximally vascularised | 51.11 | 3.18 | 44.00 | 55.00 | 51.11 | 3.18 | 44.00 | 55.00 | 1.000 |
| PMA at time of laser | 55.67 | 1.32 | 55.00 | 57.00 | 55.67 | 1.32 | 55.00 | 57.00 | 1.000 |
IVB, intravitreal bevacizumab; IVI, intravitreal injection; IVR, intravitreal ranibizumab; PMA, postmenstrual age.