TABLE 1

Characteristics and distribution of asynchronies

Rate of asynchronyOverall (n=40)Mask (n=20)Helmet (n=20)p-value
AI <10% (tracings)4.0±3.3% (20)4.4±3.3 (9)3.6±3.3 (11)0.752
AI ≥10% (tracings)18.1±5.8% (20)18.4±5.2% (11)17.7±6.9% (9)
IE33.3%25.3%44.8%0.047
AT40.5%42.2%38.0%0.665
DT26.2%32.5%17.2%0.014

Data are presented as mean±sd (n), unless otherwise stated. p-values refer to Chi-squared test between interfaces. AI: asynchrony index; IE: ineffective effort; AT: autotriggering; DT: double-triggering.