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Table 1 Description of the sample population

From: Association between urban environment and mental health in Brussels, Belgium

Socio-economic status
Age median [IQR]/N 47 [34–63]/1325
Sex % [95% CI]/N
 M 50.59 [47.70–53.47]/616
 F 49.41 [46.53–52.30]/709
Year % [95% CI]/N
 2008 53.93 [50.19–57.62]/775
 2013 46.07 [42.38–49.81]/550
Highest educational level in the household % [95% CI]/N
 No diploma/primary education/lower secondary 19.34 [16.75–22.21]/285
 High secondary 26.77 [23.67–30.12]/365
 Higher 53.89 [50.22–57.52]/675
Household composition % [95% CI]/N
 Single 35.10 [31.70–38.67]/416
 One parent with child [ren] 10.92 [8.91–13.32]/145
 Couple without child [ren] 18.86 [16.26–21.76]/277
 Couple with child [ren] 29.03 [25.64–32.66]/395
 Other/unknown 6.10 [4.53–8.15]/92
Reported household income median [IQR]/N 1460 [1000–2000]/1325
Mental health status
Probable mental disorders [GHQ ≥ 4] % [95% CI]/N 19.81 [17.40–22.46]/255
Anxiety disorders % [95% CI]/N 9.36 [7.74–11.29]/124
Depressive disorders % [95% CI]/N 15.79 [13.61–18.25]/216
Sleeping disorders % [95% CI]/N 28.22 [25.19–31.46]/351
Environmental factors
Black carbon [annual mean μg/m3] median [IQR] 2.24 [1.95–2.62]/1325
NO2 [μg/m3] median [IQR] 34.64 [32.04–37.70]/1325
PM2.5 [μg/m3] median [IQR] 19.16 [17.82–20.11]/1325
PM10 [μg/m3] median [IQR] 26.14 [24.11–26.53]/1325
O3 [μg/m3] median [IQR] 36.25 [34.49–37.73]/1325
Vegetation coverage 600 m buffer [%] median [IQR] 35.95 [21.64–51.48]/1325
Vegetation coverage 1 km buffer [%] median [IQR] 37.96 [23.80–52.5]/1325
Street visible vegetation coverage [%] median [IQR] 3.99 [0.00–28.38]/1325
View of green median [IQR] 11.28 [6.04–22.36]/1325
Linear tree density median [IQR] 0.04 [0.00–0.15]/ 1325
Linear tree density [categories] % [95% CI]/N
 no trees 28.77 [25.41–32.38]/360
 < median 35.64 [32.22–39.20]/483
 > median 35.6 [32.19–39.12]/484
Noise from multiple sources Lden [dB] median [IQR] 50.96 [48.02–54.06]/1325
Street canyon effect median [IQR] 0.59 [0.39–0.84]/1325
Street corridor effect [0–2] median [IQR] 1.99 [1.46–2.00]/1325
Street corridor effect [categories] % [95% CI]/N
  < median 24.80 [21.74–28.17]/336
  > median 24.6 [21.64–27.76]/333
 2 50.6 [46.91–54.28]/656
Lifestyle factors
Perceived quality of social support % [95% CI]/N
 Strong/intermediate support 77.56 [74.46–80.38]/1036
 Poor support 22.44 [19.62–25.54]/289
Level of health enhancing physical activity % [95% CI]/N
 Inactive 33.33 [30.16–36.65]/468
 Minimal active 40.58 [37.44–43.79]/537
 Enough active 26.10 [23.39–29.00]/320
Chronic condition % [95% CI]/N 33.45 [30.36–36.70]/435