Intubation rates by gestation
| Proportion intubated | |||||
|---|---|---|---|---|---|
| Year 1 | Year 2 | Year 3 | Year 4 | χ2 Test for trend | |
| <30 weeks | 34/40 (85.0%) | 44/55 (80.0%) | 22/27 (81.5%) | 27/33 (81.8%) | 0.05 (NS) |
| 30–34 weeks | 22/85 (25.9%) | 19/85 (22.4%) | 9/83 (10.8%) | 6/66 (9.1%) | 11.02 (p<0.001) |
| 34–37 weeks | 14/226 (6.2%) | 4/217 (1.8%) | 5/227 (2.2%) | 3/243 (1.2%) | 7.72 (p<0.01) |
| 37 weeks + | 34/4117 (0.83%) | 28/4055 (0.69%) | 19/4065 (0.47%) | 17/4260 (0.40%) | 8.15 (p<0.01) |