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Table 5 Asthma, bronchial hyperresponsiveness and atopy in the two birth cohorts.

From: Prevalence of non-communicable diseases in Brazilian children: follow-up at school age of two Brazilian birth cohorts of the 1990's

Variables   Ribeirão Preto   São Luís P value
  n % weighted* n % weighted*  
Wheezing in the last 12 months      0.957
Yes 60 18.0 58 17.8  
No 268 82.0 270 82.2  
Missing - - 2 -  
Bronchial hyperresponsiveness **      0.069
Yes 135 39.6 111 32.5  
No 193 60.4 219 67.5  
Asthma ***      0.209
Yes 34 10.2 25 7.3  
No 294 89.8 305 92.7  
Atopy ****      < 0.001
Positive 142 44.3 81 25.3  
Negative 185 55.7 242 74.7  
Missing 1 - 7 -  
  1. Ribeirão Preto, 2004/05 and São Luís, 2005/06.
  2. * Percentages may not add to 100% because of rounding. Missing values were excluded from percentages and P-value calculations.
  3. ** PC20 ≤2 mg/ml
  4. *** Asthma defined by a subjective criterion (wheezing in the last 12 months) plus an objective criterion (bronchial hyperresponsiveness)
  5. **** Atopy was defined as at least one positive skin test for some allergens