[Retracted] Association of β2-Agonist Receptor Gene Polymorphisms with Acute Exacerbations of COPD: A Prospective Observational Study

Table 1

Comparison of clinical characteristics of different genotypes.

	Arg/Arg (n = 20)	Arg/Gly (n = 61)	Gly/Gly (n = 18)	F value/chi-square	value
Age	70.60  7.05	69.33  6.52	68.22  7.01	0.599	0.551
Male	20	58	18	1.927	0.382
Smoking index	49.68  31.92	46.07  30.28	45.69  30.56	0.117	0.890
FEV1 (L)	0.84  0.22	0.93  0.31	0.97  0.27	1.203	0.305
FEV1 (%)	32.71  8.94	36.86  11.86	36.02  9.91	1.072	0.346
FEV1/FVC (%)	38.58  10.72	39.12  10.26	44.35  9.08	2.070	0.132
CATscore	15.30  4.89	15.23  6.45	14.44  6.30	0.127	0.881
mMRC	2.45  1.00	2.25  1.06	1.72  1.13	2.439	0.093
Exacerbations	16 (80.0%)	30 (49.2%)	7 (38.9%)	7.649	0.022

Note. FEV1, FVC, CAT, mMRC.