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Table 2 Baseline characteristics of participants in Suzhou

From: Long-term ambient air pollution exposure and cardio-respiratory disease in China: findings from a prospective cohort study

 

Men

(n = 20,846)

Women

(n = 29,561)

Total follow-up time (CVD), person-years

55,962

80,193

Total follow-up time (respiratory disease), person-years

57,706

82,830

Age, years, mean (SD)

51.9 (10.1)

51.5 (10.2)

Education

  

 No formal school

9.7

43.3

 Primary school

40.0

26.8

 Middle school

36.4

22.8

 High school and above

13.8

7.1

Smoking

  

 Never smoker

7.7

99.1

 Occasional smoker

10.8

0.5

 Ex regular smoker

12.7

0.0

 Current regular smoker

68.7

0.4

Passive smoking

  

 Never

22.9

7.5

 Yes, but not now

57.1

27.5

 Yes, at present

20

65

Alcohol consumption

  

 Never

16.2

89.1

 Ex-regular / Reduced intake

10.6

0.3

 Occasional / Monthly

32.2

10.0

 Current regular

41.1

0.6

Self-rated health

  

 Excellent

33.4

26.6

 Good

32.9

31.7

 Fair

26.5

29.8

 Poor

7.1

11.9

Physical activity, MET-hr/day, mean (SD)

27.8 (15.9)

24.4 (14.3)

Self-reported disease

  

 Hypertension

10.8

11.5

 Stroke/TIA

1.1

0.6

 TB

1.6

0.6

 CHD

1

1

 Asthma

0.7

0.8

 Emphysema/Bronchitis

4.5

4.5

Family history of diseasea

  

 Stroke

18.7

17.0

 Myocardial infarction

1.9

2.1

Cardiorespiratory symptomsb

  

 Breathlessness

2.0

3.8

 Chest pain

1.0

2.2

 Chronic cough

4.8

2.3

  1. Values are percentages, unless otherwise stated
  2. a Family history defined as baseline reported disease prevalence in mother and/or father
  3. b Breathlessness and chest pain defined as being “short of breath”, and “slowing down due to chest discomfort”, respectively, when “walking on level ground with health people of the same age”. Chronic cough defined as “coughing frequently for ≥ 3 months"