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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