Table 3.
HRV | Cortisol | Singular models HRV | Singular models cortisol | Inter-relation models | Model comparison | |||||||||
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βhrv | F | R2 | βcort | F | R2 | βcort | βhrv | βint | F | R2 | ΔFb | ΔR2 | ||
LF | −.01 | 4.22 | .18 | – | – | – | – | – | – | – | – | – | – | |
AUCAG | – | – | – | .17* | 4.82 | .20 | −.21 | −.54** | .67** | 4.96 | .25 | 4.72* | .04 | |
AUCI | – | – | – | .08 | 4.23 | .18 | .07 | −.03 | .08 | 3.86 | .20 | 0.15 | .00 | |
SlopeMax a | – | – | – | .15 | 4.52 | .21 | .27 | −.56** | −.24 | 4.81 | .26 | 5.56** | .04 | |
Maximum | – | – | – | .19* | 4.96 | .21 | −.17 | −.49** | .63** | 5.05 | .25 | 3.76* | .03 | |
HF | −.05 | 4.29 | .19 | – | – | – | – | – | – | – | – | – | – | |
AUCAG | – | – | – | – | – | – | .08 | −.23 | .19 | 4.10 | .21 | 0.94 | .01 | |
AUCI | – | – | – | – | – | – | .21 | −.04 | −.07 | 3.95 | .21 | 0.54 | .00 | |
SlopeMax a | – | – | – | – | – | – | .17 | −.17 | .01 | 3.72 | .23 | 0.39 | .00 | |
Maximum | – | – | – | – | – | – | .16 | −.15 | .08 | 4.34 | .22 | 0.74 | .01 | |
LF/HF ratio | .01 | 4.22 | .18 | – | – | – | – | – | – | – | – | – | – | |
AUCAG | – | – | – | – | – | – | −.10 | −.23 | .37 | 4.15 | .22 | 1.19 | .01 | |
AUCI | – | – | – | – | – | – | −.33 | −.12 | .52* | 4.50 | .23 | 2.96* | .04 | |
SlopeMax a | – | – | – | – | – | – | .82 | −.02 | −.79 | 3.93 | .24 | 1.12 | .01 | |
Maximum | – | – | – | – | – | – | −.22 | −0.39± | .59* | 4.79 | .24 | 2.65± | .02 |
Note: All analyses controlled for age, sex, BMI Z-score, adrenarche, parental education, household income, sleep duration, & wake-time. βcort = standardized beta coefficient for cortisol measure. βhrv = standardized beta coefficient for HRV measure. βint = standardized beta coefficient for interaction term. 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 < .07
p < .05
p < .01.
Analyses also controlled for maximum cortisol sample, anchor point for calculation of SlopeMax.
Change in F test-statistic conservatively based on higher F test-statistic of either singular model.