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This quantitative case study aimed to learn and analyze the personnel cost in nursing direct care in the intensive care unit. We opted to use a therapeutic intervention score index, TISS-28, for the analysis of the indirect gravity of patients and the dimension of the nursing staff working time. ⋯ It was evidenced in this study that personnel costs are variable since there are patients with different complexities. Therefore is possible to estimate the nursing staff cost by assessing its work load.