Table 1

(A) Fraction of particles escaping the headbox relative to open frame (no headbox) measurements, and 95% CI at 10, 20, 30, 40 and 50 L/min of HFNO and (B) estimated fraction of particles escaping the box calculated using a computational fluid dynamic model and the estimated effect of cough

(A) Measured experimental data (to four decimal places)
Flow rateOpen headboxHeadbox+BlanketHeadbox+Filter
MeanCI (95%±)MeanCI (95%±)MeanCI (95%±)
100.17570.02240.43210.05960.00026.54E-06
200.15520.01980.75710.10440.00026.54E-06
300.29910.03820.68940.09510.00026.54E-06
400.60150.07680.57790.07970.00026.54E-06
500.57740.07370.60510.08340.00039.81E-06
Mean0.36180.04620.61230.08440.00027.20E-06
(B) Computer simulated data and effect of cough (to three decimal places)
Open headboxHeadbox+BlanketHeadbox+Filter
Computer simulation data (average of 10 and 50 L/min)0.4510.2110.017
Experimental data (average of 10 and 50 L/min)0.3760.5190
Error between experiment and simulation0.075−0.3080.017
Simulated cough0.4690.150.01