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Table

From: Comfort levels of six CPAP delivery systems

   Pressure deviation (cmH2O) from CPAP level at 25 l/min flow
CPAP delivery system Subjective ranking Inspiration Expiration Overall
Respironics Vision 1 -0.8 -0.1 0.6
Respironics S/T 2 -0.6 0.1 0.8
Drager Evita 4 (NIV) 3 -1.1 1.3 2.4
Drager Evita 4 4 -1.1 1.3 2.5
Drager CF 800 5 -1.3 0.7 2.0
Siemens Servo 300 6 -1.1 2.3 3.4
Spearman Correlation with ranking P value   -0.76 0.83 0.89
   0.084 0.04 0.017
  1. NIV, new non-invasive software.