Details of infants studied
| Group | n | Postnatal age (days) | Gestation (weeks) | Birth weight (kg) |
| Amethocaine | 30 | 5 (1–9) | 36.5 (28–42) | 2.32 (1.00–3.94) |
| Placebo | 29 | 5 (1–16) | 36 (28–40) | 2.40 (1.15–3.43) |
| p value | 0.66 | 0.60 | 0.45 |
Values are medians (ranges). p Value obtained by the Mann-Whitney U test.