Balance of baseline characteristics for infants with gestational age 25–27 weeks (n=843) before and after propensity score matching for infants treated with less invasive surfactant administration (LISA) and the rest of the infants (non-LISA, panel 1), and for LISA infants and infants who received their initial dose of surfactant after endotracheal intubation (non-LISA+S, panel 2)
| All patients | Only patients who received surfactant | |||||||
| Before matching | After matching | Before matching | After matching | |||||
| LISA | Non-LISA | LISA | Non-LISA | LISA | Non-LISA+S | LISA | Non-LISA+S | |
| Number of infants | 222 | 621 | 198 | 198 | 222 | 441 | 146 | 146 |
| Gestational age, days, mean | 187 | 186 | 187 | 187 | 187 | 185 | 186 | 186 |
| Birth weight*, g, mean | 877 | 865 | 879 | 875 | 877 | 835 | 877 | 873 |
| Apgar score, 5 min, mean | 7.6 | 6.6 | 7.5 | 7.5 | 7.6 | 6.2 | 7.2 | 7.2 |
| CRIB II score | 10.2 | 10.7 | 10.2 | 10.2 | 10.2 | 11.2 | 10.4 | 10.5 |
| Year of birth | 2015.1 | 2014.6 | 2015.0 | 2015.0 | 2015.1 | 2014.6 | 2014.8 | 2015.0 |
| Small for gestational age*, % | 23% | 24% | 23% | 22% | 23% | 25% | 21% | 21% |
| Antenatal steroids, % | 94% | 90% | 94% | 93% | 94% | 90% | 93% | 93% |
| Caesarean section, % | 47% | 51% | 46% | 45% | 47% | 55% | 47% | 44% |
| Sex, female, % | 46% | 45% | 44% | 42% | 46% | 42% | 42% | 45% |
*Not included in propensity score model, but shown for comparison.