Table 1

The distribution of confounders between "cases" i.e. individuals reporting hypertension and "non-cases" being those not reporting hypertension divided in three groups by level of road traffic noise exposure.

Cases

Non-cases


LAeq 24 hr (dB)

All (0-71)

<45

45-54

≥55

Individuals per group

4644

4688

9337

5569

median (q1-q3)

median (q1-q3)

median (q1-q3)

median (q1-q3)

Age

61 (53-69)

45 (35-57)

45 (33-58)

42 (30-57)

BMI

26.7 (24.3-29.4)

24.4 (22.3-26.9)

24.5 (22.2-27.1)

24.2 (22-26.6)

Alcohol consumption index

3 (1-4)

3 (2-4)

3 (2-4)

3 (2-5)

N (%)

N (%)

N (%)

N (%)

Smoking

Never

2319 (49.9)

2763 (58.9)

5197 (55.7)

2992 (53.7)

Former

1485 (32)

1087 (23.2)

2180 (23.3)

1258 (22.6)

Current (not every day)

159 (3.4)

187 (4)

463 (5)

305 (5.5)

Current (every day)

681 (14.7)

651 (13.9)

1497 (16)

1014 (18.2)

Sex

Man

2439 (52.5)

2101 (44.8)

4115 (44.1)

2447 (43.9)

Woman

2205 (47.5)

2587 (55.2)

5222 (55.9)

3122 (56.1)

Education

Lower education

3502(75.4)

3054 (65.1)

6004 (64.3)

3405 (61.1)

Higher education

1142(24.6)

1634 (34.9)

3333 (35.7)

2164 (38.9)

Exercise

Mainly sedentary

819 (17.6)

551 (11.8)

1165 (12.5)

741 (13.3)

Light/Moderate

3306 (71.2)

3366 (71.8)

6561 (70.3)

3823 (68.6)

Regular

519 (11.2)

771 (16.4)

1611 (17.3)

1005 (18)

Socioeconomic status

High level non-manual

291 (6.3)

545 (11.6)

1030 (11)

664 (11.9)

Middle level non-manual

427 (9.2)

836 (17.8)

1549 (16.6)

839 (15.1)

low level non-manual

282 (6.1)

427 (9.1)

761 (8.2)

429 (7.7)

Skilled manual

349 (7.5)

537 (11.5)

1083 (11.6)

564 (10.1)

Unskilled manual

479 (10.3)

690 (14.7)

1406 (15.1)

799 (14.3)

Self-employed/Farmer

205 (4.4)

407 (8.7)

465 (5)

262 (4.7)

Disabilty pension

424 (9.1)

176 (3.8)

377 (4)

231 (4.1)

Unemployed

175 (3.8)

190 (4.1)

431 (4.6)

354 (6.4)

Stuadent

77 (1.7)

296 (6.3)

829 (8.9)

628 (11.3)

Old-age pension

1833 (39.5)

514 (11)

1252 (13.4)

718 (12.9)

Long-term sickness absence

102 (2.2)

70 (1.5)

154 (1.6)

81 (1.5)


Bodin et al. Environmental Health 2009 8:38   doi:10.1186/1476-069X-8-38

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