Table 4. Meta-Analyses on Zero-Order, Age-Adjusted, Non-ROI Thickness-Adjusted Partial Correlation Coefficients of Cortical Thickness in Selected Regions of Interest (ROI) and Resting State Heart Rate Variability across Study 1 and Study 2 (Left Hemisphere);

Fixed effect meta-analyses; values represent correlation coefficients (r) and their 95% confidence interval; ACC: anterior cingulate cortex; MFG: middle frontal gyrus; OFC: orbital frontal cortex; * and bold: highlights a significant meta correlation on the p < .05 level; ** and bold: highlights a significant meta correlation on the p < .01 level

Meta-analyses	Left Hemisphere
	unadjusted		age adjusted		non-ROI thickness adjusted		Age & non-ROI thickness adjusted
	meta r	95%CI	meta r	95%CI	meta r	95%CI	meta r	95%CI
Caudal ACC	0.222*	0.010; 0.416	0.110	−0.108; 0.319	0.157	−0.061; 0.360	0.108	−0.114; 0.318
Rostral ACC	0.315**	0.109; 0.495	0.172	−0.046; 0.374	0.247*	0.033; 0.439	0.169	−0.051; 0.374
Caudal MFG	0.306**	0.099; 0.487	0.120	−0.098; 0.327	0.207	−0.009; 0.405	0.180	−0.040; 0.383
Rostral MFG	0.199	−0.015; 0.395	0.018	−0.199; 0.232	0.033	−0.184; 0.247	0.035	−0.185; 0.251
Lateral OFC	0.312**	0.106; 0.492	0.200	−0.016; 0.399	0.211	−0.005; 0.408	0.222*	0.004; 0.420
Medial OFC	0.143	−0.073; 0.345	−0.020	−0.234; 0.197	0.032	−0.185; 0.246	−0.016	−0.234; 0.203
Pars opercularis	0.235*	0.023; 0.427	0.049	−0.168; 0.262	0.089	−0.130; 0.299	0.096	−0.125; 0.308
Pars orbitalis	0.207	−0.006; 0.403	0.077	−0.141; 0.288	0.053	−0.164; 0.266	0.068	−0.153; 0.282
Pars triangularis	0.203	−0.011; 0.399	−0.023	−0.237; 0.194	0.045	−0.173; 0.258	0.011	−0.208; 0.228
Superior frontal G.	0.270*	0.060; 0.456	0.018	−0.198; 0.233	0.143	−0.076; 0.348	0.037	−0.183; 0.254
Frontal pole	0.094	−0.122; 0.301	0.012	−0.204; 0.227	−0.047	−0.260; 0.170	0.002	−0.217; 0.220
Insula	0.271*	0.062; 0.458	0.115	−0.104; 0.322	0.151	−0.067; 0.355	0.116	−0.105; 0.326