Table 3

Group ventilation indices across all participants, and the relative contribution of the variance between and within participants for each of the ventilator measurement indices

Ventilation measurements
(derived from daily averages)
ANOVA modelModelled variance
Mean
(95% CI)
Between participants, %Within participants, %
Usage (hours)8.53 (7.78 to 9.29)6139
Total leak (L/min)46.0 (40.9 to 51.1)8317
Unintentional leak (L/min)13.2 (10.2 to 16.2)6436
Participant triggered breaths (%)62 (48 to 76)937
Tidal volume (mL)414 (362 to 466)937
Minute ventilation (L/min)7.6 (6.6 to 8.5)928
Respiratory rate (bpm)18 (16.8 to 19.2)928
Apnoea hypopnoea index (events per hour)3.6 (1.3 to 5.8)7129
  • AHI, Apnoea–Hypopnoea Index; ANOVA, analysis of variance.