Research on the effectiveness and safety of bronchial thermoplasty in patients with chronic obstructive pulmonary disease

Table 3 Assessment of COPD acute exacerbation risk between the two groups of patients

Project	Group	Time		Z/X²	P
Project	Group	1 year before treatment	1 year after treatment	Z/X²	P
Proportion of high-risk patients with acute exacerbation of COPD (%)	Control group	29 (100%)	19 (65.5%)	8.100	0.002
	Intervention group	28 (100%)	8 (28.6%)	18.050	< 0.001
	X²	–	7.800
	P	–	0.005
Cumulative number of patients with acute exacerbation of COPD	Control group	3.0 (2.50, 5.0)	1.0 (1.0, 2.50)	− 4.795	< 0.001
	Intervention group	3.0 (3.0, 4.0)	0 (0, 1.0)	− 4.697	< 0.001
	Z	− 0.363	− 3.624
	P	0.717	< 0.001
Number of inpatients with acute exacerbation of COPD (%)	Control group	29 (100%)	18 (62.1%)	9.091	0.001
	Intervention group	28 (100%)	8 (28.6%)	18.050	< 0.001
	X²	–	6.443
	P	–	0.011
Cumulative number of inpatients with acute exacerbation of COPD	Control group	2.0 (2.0, 3.0)	1.0 (0, 2.0)	− 4.381	< 0.001
	Intervention group	2.0 (2.0, 3.0)	0 (0, 1.0)	− 4.960	< 0.001
	Z	0.009	− 3.050
	P	0.993	0.002

Data were expressed as percentage or median (interquartile range), with significance level at P value < 0.05

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