Table 4 Pearson correlations between high-frequency heart rate variability and sample entropy during the Trier Social Stress Test.

	HF-HRV stress				HF-HRV recovery				Sample entropy stress				Sample entropy recovery
	Indigenous		Non-Indigenous		Indigenous		Non-Indigenous		Indigenous		Non-Indigenous		Indigenous		Non-Indigenous
	R	p	R	p	R	p	R	p	R	p	R	p	R	p	R	p
Chronic stress (PSS)	0.024	0.947	0.371	0.262	0.087	0.810	0.067	0.844	0.028	0.938	0.780	0.005	−0.154	0.672	0.659	0.027
Chronic stress (K6)	0.043	0.905	0.117	0.733	0.168	0.642	−0.149	0.662	0.156	0.666	0.759	0.007	−0.463	0.178	0.531	0.093
SES	0.741	0.014	−0.054	0.874	0.726	0.017	0.106	0.757	0.159	0.660	−0.522	0.100	0.382	0.276	−0.256	0.447
Internalising	−0.576	0.082	0.318	0.341	−0.633	0.049	−0.06	0.862	−0.485	0.155	0.782	0.004	−0.436	0.208	0.253	0.453
Depression	−0.364	0.301	0.17	0.618	−0.269	0.452	−0.292	0.384	−0.372	0.29	0.809	0.003	−0.509	0.133	0.605	0.049
Anxiety	−0.621	0.055	0.225	0.505	−0.533	0.112	−0.151	0.657	−0.579	0.08	0.503	0.115	−0.055	0.881	0.046	0.893
Negative Life Events	−0.317	0.373	−0.169	0.619	−0.263	0.462	−0.374	0.257	−0.352	0.318	0.127	0.709	−0.019	0.959	−0.063	0.855
SEWB	−0.614	0.078			−0.465	0.207			−0.788	0.012			0.004	0.993
Depression	−0.666	0.050			−0.435	0.242			−0.708	0.033			−0.236	0.541
Anxiety	−0.392	0.297			−0.236	0.540			−0.501	0.170			0.209	0.590
Suicide risk	−0.246	0.524			−0.131	0.736			−0.485	0.186			0.153	0.695
Resilience	−0.259	0.501			−0.347	0.361			−0.454	0.220			−0.072	0.854
Interpersonal racism	0.357	0.311			0.587	0.074			−0.139	0.300			0.467	0.174
Internalized racism	0.566	0.088			0.340	0.337			0.654	0.040			0.028	0.940

HF-HRV = high frequency heart rate variability; correlations were not calculated for childhood adversity due to n = 5 in one group.

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