Demographics and clinical characteristics according to β2-adrenergic receptor genotype
| Gly-Gly n = 105 | Arg-Gly n = 88 | Arg-Arg n = 3 | p value | |
| Age (years) | 46 (43–49) | 46 (43–49) | 45 (39–52) | 0.97 |
| FEV1 (% predicted) | 86 (82–90) | 85 (81–89) | 88 (82–94) | 0.72 |
| FEF25–75 (% predicted) | 59 (53–65) | 57 (51–63) | 58 (49–66) | 0.85 |
| FEV1/FVC | 0.72 (0.70–0.75) | 0.71 (0.68–0.74) | 0.74 (0.70–0.77) | 0.49 |
| ICS Dose (BDP equivalent, µg/day) | 800 (800–1500) | 800 (680–2000) | 800 (400–1250) | 0.65 |
| LABA (%) | 76 | 74 | 60 | 0.21 |
| ACQ-6 | 1.78 (1.53–2.03) | 1.53 (1.28–1.78) | 1.93 (1.36–2.50) | 0.23 |
Data presented as mean (95% CI) except for ICS dose which is presented as median (IQR)