EMONO group (n=22) | Control group (n=18) | |
---|---|---|
Gestational age at birth (weeks) | 27.8±1.6 | 28.1±1.7 |
Corrected gestational age at examination (weeks) | 35.0±1.8 | 35.4±1.5 |
Birth weight (g) | 1003.4±199.0 | 1052.2±297.9 |
Weight at examination (g) | 2174.5±426.5 | 2174.4±373.1 |
Male/female | 13/9 | 9/9 |
Clinical Risk Index for Babies II Score30 | 9.0±2.6 | 8.3±2.6 |
Completed antenatal steroids* (%) | 16 (72.7) | 15 (83.3) |
Prior intubation (%) | 12 (54.5) | 11 (61.1) |
On supplemental oxygen by nasal cannula at the time of examination (%) | 12 (54.5) | 7 (38.9) |
On caffeine at the time of examination (%) | 12 (54.5) | 10 (55.6) |
Prior IVH grade II or IV, PVL (%)31 | 1 (4.5) | 1 (5.6) |
Prior ligation of patent ductus arteriosus | 6 (27.2) | 5 (27.8) |
Number of previous eye examinations | 1.4±1.9 | 1.4±1.3 |
Previous surgery for retinopathy of prematurity (%) | 1 (4.5) | 1 (5.6) |
Number of painful procedures in the 24 h preceding the eye examination | 0.23±0.43 | 0.11±0.32 |
↵* Received two doses of 12 mg intramuscular betamethasone 24 h apart or four doses of intramuscular dexamethasone at 12-h intervals.
EMONO, equimolar mixture of nitrous oxide and oxygen; IVH, intraventricular haemorrhage; PVL, periventricular leukomalacia.