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Table 1 Baseline characteristics according to exposure to road traffic noise above and below 55 dB(A) (Lden) at enrolment of 44,083 cohort participants

From: Exposure to road traffic and railway noise and associations with blood pressure and self-reported hypertension: a cohort study

 

Mean Lden levels the year preceding enrolment

Characteristic, at enrolment

< 55 dB(A)

≥ 55 dB(A)

 

% (N)

Median

(5-95 percentiles)

% (N)

Median

(5-95 percentiles)

All

100 (18,522)

 

100 (25,561)

 

Age (years)

 

55.7 (50.7-64.0)

 

56.1 (50.7-64.2)

Gender

    

   Women

51 (9,372)

 

53 (13,556)

 

   Men

49 (9,150)

 

47 (12,005)

 

Years of education

    

   ≤ 7

30 (5,609)

 

34 (8,772)

 

   8-10

46 (8,557)

 

46 (11,682)

 

   ≥ 11

24 (4,356)

 

20 (5,107)

 

Municipality SESa

    

   Low

9 (1,638)

 

18 (4,630)

 

   Medium

70 (13,028)

 

61 (15,544)

 

   High

21 (3,856)

 

21 (5,387)

 

Area

    

   Copenhagen city

16 (3,013)

 

33 (8,473)

 

   Aarhus city

44 (8,091)

 

19 (4,937)

 

Copenhagen/Aarhus

surroundings

40 (7,418)

 

48 (12,151)

 

BMI (kg/m2)

 

25.2 (20.4-32.4)

 

25.4 (20.3-33.0)

Smoking

    

   Never

38 (7,039)

 

34 (8,648)

 

   Former

29 (5,284)

 

27 (6,865)

 

   Current

33 (6,199)

 

40 (10,048)

 

Drinking alcohol

    

   No

2 (347)

 

2 (607)

 

   Yes

98 (18,175)

 

98 (24,954)

 

Among active drinkers (g/day)

 

13.4 (1.31-61.2)

 

13.4 (1.03-66.9)

Physical activity

    

   No

42 (7,789)

 

47 (11,990)

 

   Yes

58 (10,733)

 

53 (13,571)

 

   Among active (h/week)

 

2.0 (0.5-7.0)

 

2.0 (0.5-7.0)

Railway noise ≥ 60 dB

13 (2,364)

 

19 (4,885)

 

Lden, 1 yearb (dB(A))

 

51.7 (46.3-54.7)

 

61.1 (55.5-71.7)

NOx, 1-yearb (μg/m3)

 

17.5 (13.8-25.3)

 

25.3 (15.9-112)

  1. a Socioeconomic status of municipalities based on municipality information on education, work market affiliation and income
  2. b Time-weighted average level at residences for one years preceding enrolment