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. Author manuscript; available in PMC: 2022 Mar 14.
Published in final edited form as: Int J Psychophysiol. 2021 Jan 30;164:1–8. doi: 10.1016/j.ijpsycho.2021.01.019

Table 1.

Interaction of chronic stress and performance on the Digit Symbol Substitution Test (DSST) at each HRV quartile.

HRV
quartile		 RMSSD SDNN
Q1 −1.37 (−2.62 to −0.11) p = .03 −1.43 (−1.89 to −0.96) p <.001
Q2 −1.76 (−2.34 to −1.18) p <.001 −0.06 (−1.79 to 0.52) p = .28
Q2 0.48 (−0.28 to 1.24) p = .22 0.97 (−0.29 to 2.23) p = .97
Q4 1.88 (1.08 to 2.68) p < .001 1.68 (0.94 to 2.43) p < .001

Note: Estimates, 95% confidence intervals and p-values for the interaction with chronic stress on DSST for each HRV quartile (N = 1420). At the highest quartile of RMSSD and SDNN the association between chronic stress and DSST performance became positive and significant. At the lowest HRV quartiles the association between stress and DSST was negative and significant (ps .03 to <.0001).