Table 4. Pearson correlation matrix between factors and with the global SCSvp (N=178). Coimbra, Portugal, 2011.

	Factor 1			Factor 2			Factor 3			Factor 4
	r	p		r	p		r	p		r	p
Factor 1 (neurological dysfunction)				0.602	0.000		0.627	0.000		0.868	0.000
Factor 2 (respiratory)	0.602	0.000					0.679	0.000		0.863	0.000
Factor 3 (cardiac)	0.627	0.000		0.679	0.000					0.877	0.000
Global SCSvp	0.868	0.000		0.863	0.000		0.877	0.000