Methacholine negative (n = 1932) | Methacholine positive (n = 305) | P value | |||
---|---|---|---|---|---|
Mean | SD | Mean | SD | ||
Age (years) | 24.10 | 3.65 | 24.50 | 3.80 | 0.16 |
Females | 367 (19%) | – | 67 (22%) | – | 0.22* |
Height (cm) | 173.60 | 8.29 | 172.89 | 9.16 | 0.18 |
Weight (kg) | 69.53 | 12.26 | 68.77 | 13.50 | 0.36 |
BMI (kg/m2) | 23.01 | 3.44 | 22.80 | 3.46 | 0.56 |
Smoking n (%)** | 0.26 | ||||
Non-smoker | 176 (67) | 42 (67) | |||
Ex-smoker | 12 (5) | 6 (9) | |||
Smoker | 75 (28) | 15 (24) | |||
Total | 263 (100) | 63 (100) | |||
FEV1/FVC ratio (%pred) | 84.10 | 7.40 | 80.10 | 7.50 | < 0.01 |
FEV1 (%pred) | 95.40 | 11.00 | 89.10 | 11.70 | < 0.01 |
FEF50% (%pred) | 89.80 | 22.80 | 75.10 | 18.00 | < 0.01 |
FVC (%pred) | 99.50 | 13.00 | 96.50 | 13.00 | < 0.01 |
FEF25–75% (%pred) | 86.90 | 23.10 | 82.70 | 22.80 | < 0.01 |
angle β (°) | 186.96 | 15.01 | 180.92 | 12.36 | < 0.01 |