Figure 5

Shift work schedule of three subjects in a three-day cycle. The red, green, and blue areas represent the working segments of subjects S_01, S_02, and S_03, respectively. Each subject work 7 segments every three days, consisted of one Type I day, one Type II day, and one Type III day. (The figure was generated by PowerPoint 2019, URL: https://www.microsoftstore.com.cn/software/office).