Anticholinergics aggravate the imbalance of the autonomic nervous system in stable chronic obstructive pulmonary disease

Table 4 Multiple linearregression with HRR as the dependent variable

Coefficients
Model		Unstandardized Coefficients		Standardized Coefficients	t	Sig.
Model		B	Std.Error	Beta	t	Sig.
1	(Constant)	12.641	3.783		3.342	.001
	using tiotropium	−4.327	2.005	−.265	−2.158	.035
	peak VCO₂	.006	.002	.313	2.549	.014

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