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Table 3 Sociodemographic characteristics of the study sample

From: Asthma in changing environments - chances and challenges of international research collaborations between South America and Europe - study protocol and description of the data acquisition of a case-control-study

% (N) Cases
(N = 188)
Controls
(N = 294)
Mean age in years (SD) 10.6 (2.6) 10.7 (2.7)
Boys 99 (52.7) 157 (53.4)
Residence in urban area of Valdivia 150 (80.7) 252 (85.7)
Atopic sensitizationa*** 147 (78.2) 138 (46.9)
At least one parent with atopic disease*** 65 (34.6) 56 (19.1)
At least one parent with university attendance 38 (20.3) 59 (20.1)
Total IgE > 100 IU/ml*** 104 (64.2)c 108 (44.1)d
Parasitic infectione 26 (18.8)f 28 (20.4)g
12 months prevalence of:   
- wheeze*** 126 (67.7) 48 (16.4)
- rhinitis*** 154 (81.9) 150 (51.0)
- atopic dermatitis symptoms 45 (24.3) 56 (19.2)
  1. a Positive skin prick test at least one allergen
  2. b Atopic disease indicates self-reported asthma or rhinoconjunctivitis
  3. c N available: 162
  4. d N available: 245
  5. e Parasitic infection to Endolimax nana, Blastocystis hominis, Entamoeba coli, and Giardia lamblia
  6. f N available 138
  7. g N available 137
  8. *** chi 2 < 0.0001
  9. SD standard deviation