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Official Journal of the Japan Wood Research Society

Journal of Wood Science Cover Image
Fig. 2 | Journal of Wood Science

Fig. 2

From: Association of wood use in bedrooms with comfort and sleep among workers in Japan: a cross-sectional analysis of the SLeep Epidemiology Project at the University of Tsukuba (SLEPT) study

Fig. 2

Proportion of poor sleep conditions according to the amount of wood in bedrooms. a Proportion of participants with poor sleep quality (PSQI ≥ 6) according to the amount of wood in the bedroom. b Proportion of participants with suspicion of insomnia (AIS ≥ 6) according to the amount of wood in the bedroom. c Proportion of participants with low sleep efficiency (< 70% by actigraphy) according to the amount of wood in the bedroom

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