TABLE III. Mediation between Age and RSFA components, by HRV (Model 1) and subdelta-band MEG (Model 2).

	Paths
		a						b						c ′						c						ab
M	DV	β	SE	Z	p	LLCI	ULCI	β	SE	Z	p	LLCI	ULCI	β	SE	Z	p	LLCI	ULCI	β	SE	Z	p	LLCI	ULCI	β	SE	Z	p	LLCI	ULCI
HRVPulseOx	IC 1	−.492	0.046	−3.730	<.001	−.599	−.385	0.298	0.054	3.643	<.001	0.167	0.421	−.158	0.053	−3.000	0.003	−.287	−.034	−.305	0.051	−3.646	<.001	−.426	−.187	−.146	0.030	−3.725	<.001	−.219	−.080
	IC 3	−.492	0.046	−3.712	<.001	−.599	−.384	0.345	0.052	3.631	<.001	0.223	0.469	−.180	0.053	−3.292	0.001	−.304	−.056	−.350	0.050	−3.610	<.001	−.469	−.238	−.169	0.030	−3.705	<.001	−.246	−.106
	IC 5	−.492	0.046	−3.756	<.001	−.600	−.383	0.349	0.051	3.650	<.001	0.225	0.464	−.052	0.057	−.907	0.365	−.184	0.084	−.223	0.053	−3.743	<.001	−.347	−.100	−.172	0.030	−3.659	<.001	−.249	−.109
	IC 6	−.492	0.046	−3.744	<.001	−.595	−.382	0.130	0.054	2.504	0.012	0.002	0.255	−.466	0.053	−3.863	<.001	−.593	−.345	−.530	0.046	−3.834	<.001	−.638	−.422	−.064	0.028	−2.416	0.016	−.133	−.002
	IC 7	−.492	0.046	−3.712	<.001	−.599	−.384	0.206	0.051	3.594	<.001	0.082	0.321	−.013	0.052	−.324	0.746	−.131	0.112	−.115	0.051	−2.409	0.016	−.229	0.008	−.102	0.027	−3.689	<.001	−.169	−.042
	IC 8	−.492	0.047	−3.702	<.001	−.601	−.383	0.249	0.056	3.718	<.001	0.121	0.379	−.087	0.059	−1.493	0.135	−.225	0.048	−.209	0.053	−3.664	<.001	−.336	−.090	−.122	0.030	−3.657	<.001	−.197	−.059
	IC 11	−.492	0.046	−3.693	<.001	−.604	−.386	−.171	0.057	−3.135	0.002	−.310	−.043	.159	0.056	2.780	0.005	0.025	0.285	0.243	0.051	3.804	<.001	0.123	0.359	−.084	0.029	−3.313	.001	−.022	−.160
	IC 12	−.492	0.046	−3.707	<.001	−.600	−.384	0.216	0.062	3.541	<.001	0.080	0.365	.416	0.057	3.778	<.001	0.286	0.552	0.309	0.051	3.681	<.001	0.189	0.429	−.106	0.033	−3.464	.001	−.192	−.040
Sub-δ-band	IC 1	0.120	0.056	2.467	0.014	0.006	0.268	0.173	0.059	3.143	0.002	0.048	0.328	−.326	0.052	−3.574	<.001	−.455	−.212	−.305	0.051	−3.614	<.001	−.430	−.191	−.021	0.010	2.747	.006	−.003	.052
(.01–08 Hz)	IC 5	0.120	0.056	2.454	0.014	0.006	0.269	0.128	0.059	2.467	0.014	0.008	0.286	−.238	0.054	−3.668	<.001	−.367	−.113	−.223	0.053	−3.704	<.001	−.347	−.099	−.015	0.008	2.612	.009	−.002	−.043

The mediation regression Coefficients (β), Standard Errors (SE), Z-scores, P-values and 99% CIs (LLCI and ULCI) for paths a, b, c, c′, and ab (see Fig. 8). The independent variable (IV) and the dependent variable (DV) were age and RSFA independent component (IC) loading values, respectively, for tests with 99% CIs not including zero. The mediator (M) in Model 1 was HRV during resting state fMRI scan recorded with pulse oximetry, while in Model 2 was global rsMEG variability in beta band.