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Comparison of sample collection variables for babies who did not and did develop BPD (mean±SD).
| No BPD | BPD | test statistic | |
|---|---|---|---|
| N | 36 | 26 | |
| Last day of endotracheal intubation during the 7-day collection period (postnatal age in days) |
4.3±2.6 | 6.7±1.2 | Mann-Whitney test, p<0.001 |
| Number of samples | 1.5±0.7 | 1.9±0.7 | Mann-Whitney test, p=0.036 |
| Day of first specimen collection (postnatal age in days) |
2.5±1.4 | 3.6±1.2 | Mann-Whitney test, p<0.001 |
Abbreviations: SD, standard deviation; N, number.
