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Table 2 Wash out period: pulmonary function tests and polygraphy

From: Switch of noninvasive ventilation (NIV) to continuous positive airway pressure (CPAP) in patients with obesity hypoventilation syndrome: a pilot study

PFT and Polygraphy (during withdrawal) n = 15
FEV1/FVC (%) 79.5 ± 7.4
FEV1 (%) 69.2 ± 16.4
FVC (%) 70.2 ± 17.3
AHI (n/h) 53.5 ± 26.9
RT < 90% (%) 21.8 ± 24.2
ODI ≥ 4% (n/h) 42.1 ± 39.5
  1. Data are expressed in mean ± standard deviation
  2. Definition of abbreviations: PFT pulmonary function test, FEV1 forced expiratory volume in 1 s, FVC forced vital capacity, AHI apnea hypopnea index, RT < 90% percentage of recording time below 90% saturation, ODI oxygen desaturation index