Table 4

Univariate logistic regression analysis for predictors of 28-day readmission

	OR	p Value	95% CI
Age	1.09	0.002	1.03 to 1.15
Hospital admission frequency	1.35	0.013	1.07 to 1.71
Haemoglobin	0.73	0.020	0.56 to 0.95
ΔEMG_para%max	1.08	0.022	1.01 to 1.15
ΔNRDI	1.002	0.036	1.000 to 1.005
ΔModified Borg scale	1.07	0.49	0.88 to 1.29
ΔCAT	0.98	0.82	0.93 to 1.03
ΔRespiratory rate	0.97	0.50	0.88 to 1.07

CAT, COPD Assessment Test; EMG_para%max, 1 min mean magnitude of rectified inspiratory parasternal EMG activity normalised to a maximal manoeuvre; NRDI, neural respiratory drive index.