. 2018 Mar 13;4(1):00099-2017. doi: 10.1183/23120541.00099-2017

TABLE 2.

Expiratory breathing characteristics calculated from flow data from a mechanical ventilator during the first 48 h of life in 33 extremely premature infants with or without later development of moderate/severe bronchopulmonary dysplasia (BPD)

	Preterm-born neonates later developing no/mild BPD	Preterm-born neonates later developing moderate/severe BPD	p-value^#
Subjects n	15	18
PTEF per kg mL·s⁻¹	27.6 (22.1–33.2)	30.2 (25.7–34.7)	0.45
t_PTEF/t_E	21.1 (15.7–26.5)	23.4 (19.8–26.9)	0.44
TEF₅₀/PTEF %	71.8 (62.9–80.6)	85.1 (81.8–88.4)	0.007
TEF₇₅/PTEF %	44.1 (33.7–54.5)	51.3 (44.2–58.5)	0.22
FV_g	0.42 (0.39–0.44)	0.44 (0.42–0.45)	0.12

Data are presented as mean (95% CI), unless otherwise stated. t_PTEF: time to peak tidal expiratory flow; t_E: expiratory time; TEF_n: tidal expiratory flow at n% of expired volume; PTEF: peak tidal expiratory flow; FV_g: flow volume gravity. ^#: independent samples t-test.