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. Author manuscript; available in PMC: 2020 Jul 1.
Published in final edited form as: Cancer Epidemiol Biomarkers Prev. 2019 May 29;28(7):1177–1186. doi: 10.1158/1055-9965.EPI-18-1018

Figure 2. Plots of light exposure and urinary melatonin level across chronotype categories, stratified by shift work.

Figure 2.

Figures 2A-2C contain plots of light exposure (in lux) for morning chronotypes (solid line), intermediate chronotypes (evenly broken line), and evening chronotypes (unevenly broken line) among day-shift workers (Figure 2A), rotating-shift workers on day/off shifts (Figure 2B), and rotating-shift workers on night shifts (Figure 2C). Figures 2D-2F contain plots of urinary melatonin rhythms (in ng/mg-creatinine) for morning chronotypes (solid line), intermediate chronotypes (evenly broken line), and evening chronotypes (unevenly broken line) among day-shift workers (Figure 2D), rotating-shift workers on day/off shifts (Figure 2E), and rotating-shift workers on night shifts (Figure 2F).