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Kendall’s Rank Correlation showing the relationship between mean daytime illuminance measured in participants’ apartments and the study outcomes: (a) sleep onset, (b) sleep duration, (c) sleep onset latency, (d) sleep efficiency, (e) sleep regularity, and (f) shift in DLMO. (Abbreviations: SRI, Sleep Regularity Index; DLMO, dim light melatonin onset; statistical significance: * represents p ≤ 0.05.)
