Table 3: Ventilation parameters in COPD and OHS.

COPD
n=51
OHS
n=34
P Values
Number of patients with APCV, n (%) 49 96.1% 28 82.3% 0,340
Pinsp in cm H2O 22 3.7 22 3.9 0,43
PEEP in cm H2O 2.3 2.5 5.3 2.7 0,18
Number of patients with PEEP = 0, n (%) 21 41% 0 0% 0,026
Effective pressure in cm H2O 18.5 0.74 16.9 0.88 0,095
Ventilation rate in breaths/min 15.8 3.3 15.3 2.9 0,48
Prescribed duration of ventilation in h/d 11.8 2.4 11.1 1.9 0,51
Number of patients rejecting therapy, n (%)* 9 18% 7 21% 0,071
Average device usage in h/d * 5.6 4.4 5.2 3.2 0,17
Number of patients with pCO2 < 5.7kPa with NIV, n (%) 36 70.6% 21 61.8% 0,11

Shown are arithmetic means and standard errors, unless indicated otherwise. Data were collected at discharge after initiation of NIV unless different stated. Ventilation parameters are set parameters * data achieved after 12 month NIV Average device usage: calculated mean of daily increase of use-hours. p-Values: non parametric test (Mann & Whitney) for independent samples.