Table 3.

NASA-TLX workload scores for each ventilator and mean differences (M_D=Mr₁–Mr₂) with the results of post hoc multiple comparisons of NASA-TLX workload scores.

NASA-TLX workload	NASA-TLX workload scores			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)
TLX (task load index)	40.042±12.304	23.750±7.628	26.083±5.791	p<.01	Servo I	Evital 4	−16.292	p<.01
					Boaray 5000D	Evital 4	−13.959	0.02
					Servo I	Boaray 5000D	−2.333	1.00
Mental demand	10.375±4.286	4.625±5.513	8.333±4.286	p<.01	Servo I	Evital 4	−5.750	p<.01
					Boaray 5000D	Evital 4	−2.042	0.28
					Servo I	Boaray 5000D	−3.708	0.47
Physical demand	2.168±3.783	0.833±1.450	0.958±1.088	0.57
Temporal demand	8.083±5.158	6.250±4.021	6.083±3.593	0.50
Performance	8.958±5.817	3.792±3.300	4.667±2.271	0.01	Servo I	Evital 4	−5.166	0.02
					Boaray 5000D	Evital 4	−4.291	0.05
					Servo I	Boaray 5000D	−0.875	1.00
Effort	7.625±5.497	5.333±3.578	3.333±3.070	0.08
Frustration	2.833±3.197	2.917±2.920	2.708±2.412	0.77

Positive M_D values representing Mr₁ lower workload than Mr₂.