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. Author manuscript; available in PMC: 2017 Dec 15.
Published in final edited form as: Biol Psychol. 2016 Feb 2;117:16–25. doi: 10.1016/j.biopsycho.2016.01.015

Table 2.

Correlations among HRV, cortisol, and covariate measures.

1 2 3 4 5 6 7
HRV measures
 1. LF –
 2. HF .81** –
 3. LF/HF ratio −.29** −.62** –
Cortisol measures
 4. AUCAG .05 .05 −.07 –
 5. AUCI .01 .03 .01 .02 –
 6. SlopeMax −.11 −.09 −.08 −.73** −.38** –
 7. Maximum .08 .07 −.06 .81** .39** −.92** –
Covariates
 Age .07 −.06 .15* −.00 .13 .02 .03
 Sex −.30** −.23** .09 .10 .13 −.08 .15*
 Adrenarche .08 −.01 .02 −.02 .09 .04 .00
 BMI Z-score −.07 −.05 −.06 −.06 −.12 .13 −.07
 Parent education −.04 .00 −.04 .03 .08 .06 −.04
 Household income .01 .03 −.03 .08 .09 −.07 .08
 Sleep duration .07 .11 −.03 −.05 −.18* −.01 −.09
 Wake-time .18* .15* −.03 −.19** −.11 .14* −.19*
 Compliance .07 .07 −.04 .01 −.02 −.04 .00

Note: AUCAG = area under curve relative to ground. AUCI = area under curve relative to increase. SlopeMax = diurnal slope anchored to max sample using regression. LF = low frequency. HF = high frequency. Bold values indicate significance:

*

p < 0.05;

**

p < 0.01.