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Table 3 Frequency of respiratory symptoms by school during the different seasons of the year; Salamanca, Guanajuato, 2004 - 2005

From: Impact of air pollution on pulmonary function and respiratory symptoms in children. Longitudinal repeated-measures study

Variables

 

Spring

Summer

Fall

Winter

Wheezing n (%)

School 1

50 (20.9)

25 (10.4)

25 (10.4)

220 (92.0)

 

School 2

22 (9.7)

12 (5.3)

16 (7.1)

216 (96.0)

 

p*

0.0001

0.04

0.20

0.61

Rhinorrhea n (%)

School 1

139 (58.1)

82 (34.3)

84 (35.1)

74 (30.9)

 

School 2

88 (39.1)

66 (29.3)

67 (29.7)

61 (27.1)

 

p*

0.0001

0.25

0.03

0.36

Eczema n (%)

School 1

12 (5.0)

18 (7.5)

6 (2.3)

31 (12.9)

 

School 2

11 (4.8)

11 (4.8)

11 (4.8)

10 (4.4)

 

p*

0.94

0.40

0.17

0.001

Acute respiratory tract infection n (%)

School 1

78 (32.6)

54 (22.5)

38 (15.8)

206 (86.1)

 

School 2

57 (25.3)

43 (19.1)

77 (34.2)

178 (79.1)

 

p*

0.50

0.35

0.001

0.04

Dyspnea n (%)

School 1

44 (18.4)

26 (10.8)

17 (7.1)

36 (15.0)

 

School 2

25 (11.1)

20 (8.8)

21 (9.3)

26 (11.5)

 

p*

0.02

0.47

0.38

0.26

Hospitalization for ARTI n (%)

School 1

2 (0.8)

2 (0.8)

2 (0.8)

17 (7.1)

 

School 2

1 (0.4)

1 1 (0.4)

1 1 (0.4)

5 (2.2)

 

p*

0.59

0.59

0.59

0.01

  1. *p value for differences between schools