Estimates of change in particle concentrations over time

EventFixed estimateLower 95% CIUpper 95% CIInterceptp-value
Particle size1.0 µm
Particle size >1 µm and ≤5 µm
Particle size >5 µm

Estimates of change in particle concentration (number/litre) per minute near the breathing-zone of the subjects for all events, based on measurements from the breathing-zone single sensor (APS 3321). Results from three particle size groups are shown. LFNC: low-flow nasal cannula; HFNC: high-flow nasal cannula; NIV: noninvasive positive-pressure ventilation; M: surgical mask.