Effect of home noninvasive positive pressure ventilation combined with pulmonary rehabilitation on dyspnea severity and quality of life in patients with severe stable chronic obstructive pulmonary disease combined with chronic type II respiratory failure: a randomized controlled trial

Table 2 The distribution of differences in CAT and mMRC scores, used to assess the condition of COPD patients, between the CTG and CPRNG groups at the first and last follow-up

variables	CTG (n = 137)	CPRNG (n = 132)	p (inter-group difference)
CAT score
First follow-up	34.6 (31.25–37.95)	33.9 (27.87–39.0)	0.165
Last follow-up	26.9 (22.77–29.95)	23.0 (19.0–28.0)	0.028
Difference^a	5.5 (4.0–9.0)	11.0 (9.0–13.0)	0.001
p** (within follow-up)	< 0.001	< 0.001	-
mMRC score
First follow-up	4.0 (3.0–4.0)	4.0 (3.0–4.0)	0.732
Last follow-up	3.0 (3.0–3.0)	2.0 (1.0–3.0)	0.015
Difference^a	1.0 (0.0–1.0)	2.0 (1.0–2.0)	0.01
p** (within follow-up)	< 0.001	< 0.001	-

CAT score COPD Assessment Test score, mMRC score Modified Medical Research Council score
^aThe difference refers to the change in scores between the first and last follow-up periods
^**The p-value indicates the statistical significance of the score differences during the follow-up period

ISSN: 1471-2466