Table 4.

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.