Table 2 Characteristics of housing and bedroom among the participants

Structure of housing

Reinforced concrete

Steel‐frame construction

Wood

266 (39.6%)

110 (16.4%)

295 (44.0%)

Type of housing

Apartment

Detached house

328 (48.9%)

343 (51.1%)

Age of building

< 10 years

10–19 years

20–29 years

≥ 30 years

235 (35.0%)

194 (28.9%)

140 (20.9%)

102 (15.2%)

Style of bedroom

Japanese

Western

194 (28.9%)

477 (71.1%)

Area of bedroom

< 6 Jo^a

6–8 Jo

≥ 8.5 Jo

46 (6.9%)

498 (74.2%)

127 (18.9%)

Amount of wood in bedroom

Large

Rather

None

194 (28.9%)

364 (54.2%)

113 (16.8%)

Wood use in bedroom

Yes

No

 Floor

439 (65.4%)

232 (34.6%)

 Wall

189 (28.2%)

482 (71.8%)

 Ceiling

233 (34.7%)

438 (65.3%)

Comfortable temperature in bedroom

Yes

No

 Feeling hot in summer

257 (38.3%)

414 (61.7%)

 Feeling cold in winter

282 (42.0%)

389 (58.0%)

Noise in bedroom

Yes

No

130 (19.4%)

541 (80.6%)