Table 1.
Effect | dfA | Beta | Standard error | p-value | % Cortisol decrease per hourB |
---|---|---|---|---|---|
Intercept | –0.542 | 0.1952 | 0.0064 | ||
Time of day (diurnal effect) | 109 | –0.124 | 0.01179 | <0.0001 | 11.7% |
Length of NE (NE duration) | 128 | –0.239 | 0.05815 | <0.0001 | 21.3% |
ADenominator degrees of freedom BCalculated as e beta estimate – 1. The diurnal effect is expressed as percent change per hour of log cortisol. Linear mixed models were used to account for multiple NEs per person (36 subjects, n = 220 saliva samples from 110 NEs). This model explains 26.9% of level-1 (residual – repeated measure) variance, 47.9% of level-2 (subject-level) variance, and 53.7% of level-3 (timepoint-level) variance.