Differences in classification of COPD patients into risk groups A-D: a cross-sectional study

BMC Research Notes

Table 4 Bivariate correlations of steps, AEE, PA ₃ and PAL with CAT, mMRC, FEV ₁ %predicted and exacerbations (n = 78)

Variable	CAT score		mMRC score¹		Exacerbations		FEV₁%predicted²
	r	p	r	p	r	p	r	p
Steps	−0.37	<0.001	−0.51	<0.001	−0.23	0.021	0.42	<0.001
AEE [cal]	−0.24	0.016	−0.30	0.006	−0.05	0.332	0.13	0.136
PA₃ [min]	−0.25	0.014	−0.27	0.011	0.02	0.430	0.05	0.337
PAL [METs]	−0.18	0.058	−0.21	0.038	0.02	0.441	0.02	0.449

AEE, active energy expenditure; CAT, COPD assessment test; FEV₁%predicted, forced expiratory volume in 1 s in % of predicted; MET, metabolic equivalent; mMRC, modified Medical Research Council; p, probability level; PAL, physical activity level; PA₃, physical activity duration above 3 METs; r, correlation coefficient. Significant p-values are highlighted in bold. ¹(n = 71); ²(n = 77).

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