Details of groups of infants having amethocaine or placebo applied before venepuncture
| Group | n | Birth weight (kg) | Gestation (weeks) | Postnatal age (days) |
| Amethocaine | 19 | 1.80 (0.85–2.92) | 33 (27–40) | 7 (3–17) |
| Placebo | 20 | 1.81 (0.94–3.35) | 33 (29–41) | 6 (2–17) |
Values are median (ranges).