Table 2.

Pulmonary function tests’ results in prematurely born young adults and gestational age at birth

Measure	Total (n = 52)	Gestational age
		24–28 weeks (n = 12)	29–34 weeks (n = 40)	p-value
FEV1, %	94.3 ± 14.28	93.00 ± 16.03	94.71 ± 13.89	0.721
FEV1, z-score	-0.39 ± 1.34	-0.60 ± 1.38	-0.32 ± 1.33	0.547
FEV1 < 80%pred.	16.0%	25.0%	13.2%	0.329
FEV1/FVC, %	91.18 ± 11.6	86.08 ± 12.29	92.79 ± 11.06	0.081
FEV1/FVC, z-score	-0.88 ± 1.39	-1.53 ± 1.24	-0.68 ± 1.38	0.062
FEV1/FVC z-score ≤-1.646	28.0%	50.0%	21.1%	0.052
MEF 25, %	88.84 ± 37.73	76.17 ± 31.39	92.74 ± 39.00	0.186
MEF 25, z-score	-0.53 ± 1.23	-0.93 ± 1.15	-0.41 ± 1.24	0.199
MEF 50, %	89.80 ± 29.84	81.75 ± 30.02	92.28 ± 29.73	0.290
MEF 50, z-score	-0.54 ± 1.39	-0.92 ± 1.46	-0.43 ± 1.36	0.284
MEF 75, %	82.25 ± 21.63	76.75 ± 25.85	83.95 ± 20.24	0.318
MEF 75, z-score	-0.83 ± 1.02	-1.10 ± 1.23	-0.75 ± 0.95	0.311
PEF, %	82.78 ± 17.77	78.08 ± 23.22	84.23 ± 15.82	0.299
PEF z-score	-1.37 ± 1.42	-1.73 ± 1.87	-1.26 ± 1.26	0.325
TLC, %	107.40 ± 10.63	106.27 ± 9.50	107.72 ± 11.03	0.695
TLC z-score	0.67 ± 0.95	0.59 ± 0.80	0.69 ± 1.00	0.755
RV, %	122.22 ± 27.03	116.75 ± 23.74	123.90 ± 28.04	0.429
RV z-score	0.86 ± 1.07	0.63 ± 0.88	0.93 ± 1.12	0.403
RV/TLC, %	112.98 ± 26.17	109.18 ± 28.18	114.05 ± 25.86	0.591
RV/TLC z-score	0.58 ± 1.17	0.40 ± 1.23	0.64 ± 1.16	0.558
FRC, %	109.76 ± 17.57	115.83 ± 16.10	107.90 ± 17.78	0.174
FRC z-score	0.51 ± 0.95	0.76 ± 0.79	0.44 ± 0.99	0.313
LCI 2.5%norm	6.52 ± 0.62	6.90 ± 0.67	6.40 ± 0.56	0.013
LCI 2.5%norm ≥6.99	21.2%	50.0%	12.5%	0.005
R5Hz	0.35 ± 0.09	0.36 ± 0.08	0.35 ± 0.09	0.965
R20Hz	0.32 ± 0.07	0.31 ± 0.07	0.32 ± 0.07	0.474
R5-R20	0.04 ± 0.04	0.05 ± 0.05	0.03 ± 0.04	0.338
X5	-0.10 ± 0.05	-0.09 ± 0.08	-0.10 ± 0.03	0.519
AX	0.33 ± 0.30	0.36 ± 0.21	0.33 ± 0.33	0.236
Fres (IOS)	11.86 ± 4.22	12.76 ± 3.40	11.59 ± 4.44	0.405
FeNO	19.34 ± 14.93	18.45 ± 11.9	19.59 ± 15.80	0.826
FeNO > 25 ppb	24.0%	27.3%	23.1%	0.774