Characteristics and outcomes of infants with 5 min SpO2 above or below 80%
| 5 min SpO2 <80% | 5 min SpO2≥80% | OR or mean difference | 95% CI | |
| Gestation (weeks) | 27.1 (1.9) | 28.2 (1.9) | −1.03 | −1.37 to 0.74* |
| Birth weight (g) | 988 (297) | 1100 (325) | −111 | −157 to 65.2* |
| Male gender | 170 (47%) | 195 (53%) | 0.93 | 0.69 to 1.26 |
| Starting FiO2 <0.3 | 209 (59%) | 254 (41%) | 3.08 | 2.26 to 4.19* |
| 5 min status | ||||
| FiO2 | 0.56 (0.23) | 0.55 (0.26) | 1.28 | −2.42 to 4.99 |
| SpO2 (%) | 63.7 (15.2) | 91.8 (6.2) | −28.1 | −29.7 to 26.4 |
| HR (bpm) | 142.0 (30.5) | 148.7 (19.5) | −6.7 | |
| HR <100 bpm† | 25/278 (9.3%) | 2/263 (1%) | 12.8 | |
| Short-term outcomes | ||||
| Dead | 41/323 (13%) | 18/303 (5%) | 2.70 | 1.58 to 4.61* |
| IVH ≥grade 3‡ | 36/310 (12%) | 16/365 (4%) | 1.82 | 1.20 to 2.75* |
| BPD§ | 73/273 (27%) | 80/349 (23%) | 1.17 | 0.89 to 1.54 |
↵*p<0.001, **p<0.05.
†557 infants had both SpO2 and heart rate detected at 5 min.
‡Head ultrasound data were obtained on 675 infants.
§Excludes deceased infants.
BPD, bronchopulmonary dysplasia; FiO2, fractional inspired oxygen; HR, heart rate; IVH, intraventricular haemorrhage; SpO2, pulse oximetry.