The Ventilatory and Diffusion Dysfunctions in Obese Patients with and without Obstructive Sleep Apnea-Hypopnea Syndrome

Table 2

Respiratory functional data of the two obese groups.

	Control group (n = 25)	OSAS group (n = 23)	Total sample (n = 48)
FEV1 (L)	3.26 ± 0.70	2.59 ± 0.75	2.95 ± 0.79	0.005
FEV1 (%)	99 ± 12	83 ± 15	91 ± 16	<0.001
FEF50% (L/s)	4.45 ± 1.14	3.72 ± 1.21	4.11 ± 1.21	0.057
FEF50% (%)	98 ± 23	85 ± 26	92 ± 25	0.057
FEF25% (L/s)	1.43 ± 0.50	1.20 ± 0.57	1.33 ± 0.54	0.217
FEF25% (%)	74 ± 22	69 ± 35	72 ± 29	0.412
MMEF (L/s)	3.51 ± 0.90	2.99 ± 0.93	3.26 ± 0.94	0.062
MMEF (%)	89 ± 19	79 ± 26	84 ± 23	0.138
SVC (L)	3.98 ± 0.90	3.25 ± 0.96	3.64 ± 0.99	0.017
SVC (%)	98 ± 14	83 ± 12	91 ± 16	<0.001
FVC (L)	4.00 ± 0.94	3.14 ± 1.02	3.60 ± 1.06	0.006
FVC (%)	100 ± 13	83 ± 14	92 ± 16	<0.001
FEV1/FVC (%)	82 ± 6.	79 ± 9	81 ± 8	0.412
RV (L)	1.66 ± 0.50	1.65 ± 0.72	1.66 ± 0.61	0.525
RV (%)	90 ± 22	84 ± 32	87 ± 27	0.241
TLC (L)	5.65 ± 1.21	4.76 ± 1.28	5.23 ± 1.31	0.018
TLC (%)	93 ± 14	79 ± 12	87 ± 15	<0.0001
DLCO (mmol/KPa/min)	10.70 ± 2.40	8.70 ± 2.40	9.80 ± 2.60	0.008
DLCO (%)	112 ± 20	93 ± 22	103 ± 23	0.001
FeNO (ppb)	18.40 ± 9.20	31.30 ± 13.60	24.85 ± 11.40	<0.0001

DLCO, carbon monoxide transfer capacity; FEF_x%, forced expiratory flow at x% of FVC; F_eNO, fraction of exhaled nitric oxide; FEV₁, forced expiratory volume at the first second; FVC, forced vital capacity; MMEF, maximal mid-expiratory flow; ns, not significant difference; RV, residual volume; SVC, slow vital capacity; TLC, total lung capacity; %, percentage of predicted value; , comparison between controls and OSAS groups by the Mann–Whitney U test.