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. 2019 Mar 15;9:4635. doi: 10.1038/s41598-019-40914-x

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Alertness, performance and subjective report for PVT performance of intensive care workers on a day shift and first and final (3^rd/4^th/5^th) night shift as measured by (a) Karolinska Sleepiness Scale, (b) subjective difficulty, (c) subjective concentration, (d) subjective motivation, (e) PVT mean reaction time (f) number of PVT lapses (g) PVT fastest 10% of reaction times and (h) maximum JDS (n = 9) during the 5-minute PVT. In all figures, higher values represent poorer outcomes. Higher values indicate increased impairment on all measures. Astericks indicate differences between shifts only at the end of shifts *p ≤ 0.05, **p ≤ 0.005, and ***p ≤ 0.001 indicates the differences in alertness and performance at the end of shifts between day and first night, day and final night and between first and final night shift.