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Table 1 Demographics and pulmonary lung function characteristics at baseline for derivation and validation cohort

From: Baseline spirometry parameters as predictors of airway hyperreactivity in adults with suspected asthma

  Derivation cohort (n = 2237) Validation cohort (n = 746) P value
Mean SD Mean SD
Age (years) 24.20 3.67 24.20 3.60 0.62
Females 434 (19%) 142 (19%)   0.83*
Height (cm) 173.53 8.42 173.87 8.50 0.34
Weight (kg) 69.43 12.45 69.40 12.70 0.96
BMI (kg/m2) 22.99 3.44 22.92 3.70 0.67
FEV1/FVC (%pred) 83.50 7.50 83.40 7.20 0.61
FEV1 (%pred) 94.50 11.30 94.40 11.30 0.92
FEF50% (%pred) 87.80 22.80 87.60 22.30 0.82
FVC (%pred) 99.10 13.00 99.50 13.20 0.49
FEF25–75% (%pred) 86.30 23.10 87.10 23.70 0.43
PC20 ≤ 16 mg/ml (%) 305 (14%) 103 (14%)   0.91*
Angle β (°) 186.14 14.80 185.88 14.80 0.68
  1. BMI, Body Mass Index; FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; FEF50%, forced expiratory flow at 50% of FVC; FEF25–75%, forced expiratory flow at 25–75% of FVC; PC20, Concentration of methacholine causing a 20% decrease in FEV1. Relative values of spirometry parameters are given as percentage of the predicted value (% pred)
  2. *P value from Chi-squared analysis