Table 1.

Blink rate for each task in ventilators and mean differences (M_D=Mr₁–Mr₂) with the results of post hoc multiple comparisons of blink rate.

Task	Mean blink rate for each task among ventilators			p	Post hoc tests with Bonferroni correction			p
	Evital 4	Servo I	Boaray 5000D
	Mean±SD	Mean±SD	Mean±SD		Mr1	Mr2	MD (Mr1–Mr2)
Task 1: start the ventilator (blinks/second)	0.201±0.557	0.115±0.593	0.122±0.067	p<.01	Servo I	Evital 4	−0.086	p<.01
					Boaray 5000D	Evital 4	−0.079	0.02
					Servo I	Boaray 5000D	−0.007	1.00
Task 2: mode and setting parameters recognition (blinks/second)	0.164±0.078	0.201±0.542	0.184±0.035	0.82
Task 3: ventilator monitoring values recognition (blinks/second)	0.103±0.074	0.186±0.041	0.156±0.044	0.01	Servo I	Evital 4	0.083	p<.01
					Boaray 5000D	Evital 4	0.053	0.34
					Servo I	Boaray 5000D	0.030	0.34
Task 4: ventilator setting parameters modification (blinks/second)	0.120±0.052	0.198±0.038	0.168±0.030	0.01	Servo I	Evital 4	0.078	0.01
					Boaray 5000D	Evital 4	0.048	0.23
					Servo I	Boaray 5000D	0.030	0.65
Task 5: ventilator mode modification (blinks/second)	0.105±0.047	0.146±0.036	0.136±0.049	0.08
Task 6: alarm parameter recognition and resetting (blinks/second)	0.108±0.051	0.151±0.067	0.179±0.056	0.02	Servo I	Evital 4	0.043	0.16
					Boaray 5000D	Evital 4	0.071	0.01
					Servo I	Boaray 5000D	−0.028	1.00
Task 7: respond to alarm (blinks/second)	0.128±0.079	0.148±0.085	0.131±0.038	0.36
Average blink rate of all tasks (second)	0.132±0.029	0.163±0.016	0.153±0.015	0.06

Positive M_D values representing Mr₁ lower workload than Mr₂.