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Official Journal of the Japan Wood Research Society

Journal of Wood Science Cover Image

Table 2 Characteristics of housing and bedroom among the participants

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

Structure of housingReinforced concreteSteel‐frame constructionWood 
266 (39.6%)110 (16.4%)295 (44.0%) 
Type of housingApartmentDetached house  
328 (48.9%)343 (51.1%)  
Age of building< 10 years10–19 years20–29 years≥ 30 years
235 (35.0%)194 (28.9%)140 (20.9%)102 (15.2%)
Style of bedroomJapaneseWestern  
194 (28.9%)477 (71.1%)  
Area of bedroom< 6 Joa6–8 Jo≥ 8.5 Jo 
46 (6.9%)498 (74.2%)127 (18.9%) 
Amount of wood in bedroomLargeRatherNone 
194 (28.9%)364 (54.2%)113 (16.8%) 
Wood use in bedroomYesNo  
 Floor439 (65.4%)232 (34.6%)  
 Wall189 (28.2%)482 (71.8%)  
 Ceiling233 (34.7%)438 (65.3%)  
Comfortable temperature in bedroomYesNo  
 Feeling hot in summer257 (38.3%)414 (61.7%)  
 Feeling cold in winter282 (42.0%)389 (58.0%)  
Noise in bedroomYesNo  
130 (19.4%)541 (80.6%)  
  1. aJo: unit of Tatami (approximately 1800 mm × 900 mm)