Table 1. Zero-, first- and second order Spearman's rho values for correlations between nCB₁IR, pEGFR-IR or ErbB2-IR and pAkt-IR.

pAkt-IR vs:	Control for:	Spearman's ρ	n	P value
nCB1IR	none	0.29	274	<0.0001
	pEGFR-IR	0.28	222	<0.0001
	ErbB2-IR	0.21	263	0.0005
	pEGFR-IR, ErbB2-IR	0.22	218	0.0014
pEGFR-IR	none	0.27	227	<0.0001
	nCB1IR	0.20	222	0.0028
	ErbB2-IR	0.22	223	0.0011
	nCB1IR, ErbB2-IR	0.18	218	0.0095
ErbB2-IR	none	0.36	271	<0.0001
	nCB1IR	0.29	263	<0.0001
	pEGFR-IR	0.37	223	<0.0001
	nCB1IR, pEGFR-IR	0.30	218	<0.0001

First- and second-order correlation coefficients were determined as described in [38].