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Table 2 Basic characteristics of the study population

From: Traffic-related air pollution and respiratory symptoms among asthmatic children, resident in Mexico City: the EVA cohort study

Characteristics

Asthmatics

(n = 147)

Nonasthmatics

(n = 50)

p value

Sex (% male)

60.5

43.4

0.031

Age [years(mean ± SD)]

9.6 ± 2.1

9.3 ± 2.2

0.975

Weight (kg)§

38.0 (28.0, 48.0)

32.3 (26.0, 44.6)

0.064

Height (cm)§

139.7 (125.0, 148.0)

132.5 (126.8, 146.2)

0.343

Maternal schooling [years(mean ± SD)]

9.7 ± 3.0

9.3 ± 3.1

0.436

Paternal smoking at home (%)

53.9

47.5

0.539

Maternal smoking at home (%)

41.2

26.2

0.135

Pets at home (%)

55.8

71.7

0.043

Carpet at home (%)

15.6

34.0

0.005

Humidity at home (%)

42.2

39.2

0.711

Prick test positivity (%)

89.2

79.1

0.089

Moderate persistent asthma (%)

19.1

  

Mild persistent asthma (%)

23.8

  

Mild intermittent asthma (%)

56.5

  

Symptoms within the past 12 months (%)

   

   Dry coughing

66.7

24.5

0.000

   Wheezing at least one time ‡

57.8

8.3

0.001

   Rhinitis ever

38.2

7.7

0.000

  1. Q, quartile.
  2. §Mann-Whitney Test [median (Q25, Q75)]
  3. Fisher Exact Test