Table 6 Correlations of HRV indices with attention and executive tests and cerebrovascular burden in the naMCI group.

	Mean (s)	Δ LFn (n.u)			Δ LF/HF			HF standing (ms²)
	Mean (s)	r	P	Q	r	P	Q	r	P	Q
Bell Test (Z-score)	− 3.06 (3.95)	− 0.110	0.300	0.400	0.078	0.463	0.505	− 0.069	0.519	0.519
DCT (Z-score)	− 0.28 (0.68)	− 0.274	0.010	0.024	− 0.309	0.004	0.022	0.080	0.460	0.505
Executive functions (Z-score)	− 0.99 (0.54)	− 0.257	0.016	0.032	− 0.339	0.001	0.016	0.161	0.136	0.204
DWML score†	1.8 (0.7)	0.277	0.009	0.024	0.274	0.010	0.024	− 0.168	0.119	0.204

Spearman's correlation analysis adjusted for hypertension, physical activity and trait anxiety. Correlations with DCT and executive scores also demographically-adjusted. Cognitive Z-scores and visual rating scale scores expressed as mean (standard deviation).
naMCI, non-amnestic mild cognitive impairment; LFn, low frequency power (normalised); n.u, normalised units; LF/HF, ratio of low frequency power (LF) to high frequency power (HF); Δ HRV index, standing HRV index—baseline HRV index; DCT, digit cancellation test; DWML, deep white matter lesions.
s, standard deviation; r, Spearman's correlation coefficient; P, adjusted P-value; Q, adjusted P-value corrected for multiple testing with the Benjamini–Hochberg procedure with a 5% False Discovery Rate (FDR).
^†On CT.

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