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Fig. 5 | Annals of Intensive Care

Fig. 5

From: A new global and comprehensive model for ICU ventilator performances evaluation

Fig. 5

Task Load Index and System Usability Scale scores. Dotted line represents the mean value across all scores (Avea excluded). SUS consists of a ten-item questionnaire and assesses usability from different aspects: effectiveness (ability of users to complete tasks); efficiency (level of resource used in performing tasks); and satisfaction (subjective reactions to using the system). SUS score has a range of 0–100, the highest score being the best value (‘simple to use’). NASA-TLX is a multidimensional tool developed for mental workload evaluation. It explores three dimensions dependent on user perception of the task (mental workload, temporal workload and physical workload) and three dimensions dependent on the interaction between the subject and the task itself, which may be mostly related to the interface (effort, performance and frustration). An individual weighting of these dimensions by letting the subjects compare them pairwise enables a decrease in the inter-/intra-individual variability of the overall score. The higher the TLX, the lower the ergonomics. Our reference device (Avea) had the best TLX and SUS scores, and V680 the worst (p = 0.049). For usability (SUS), a difference between our reference device (Avea) and S1 was also observed. *p value <0.05

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