Table 3.

Characteristics of the distribution of log-transformed salivary cortisol and immunoglobulin A concentrations.

Variable	Cortisol (ln(nmol/L))			S-IgA (ln(mg/L))
	Morning	Afternoon	p	Morning	Afternoon	p
Mean	2.93	2.12	<0.01 **	5.26	5.18	0.44
Median	2.93	2.11	<0.01 **	5.32	5.24	0.50
SD	0.38	0.34	0.29	0.78	0.66	0.42
CV	13.0%	16.1%	0.06	14.9%	12.85%	0.48
Skewness	−0.51	0.10	<0.01 **	−1.15	−1.84	0.61
Kurtosis	3.40	2.66	<0.01 **	6.01	12.57	0.09
JB	5.7	0.7		67.6	495.0
	p = 0.06	p = 0.70		p < 0.01 **	p < 0.01 **

S-IgA, secretory immunoglobulin A; SD, standard deviation; CV, coefficient of variation (SD/mean); skewness, parameter of symmetry; kurtosis, parameter of peak (positive) or flat (negative) distribution. Skewness and kurtosis of a normal distribution are 0 and 3, respectively; JB, Jarque–Bera value. A larger JB value implies that the samples are further from a normal distribution; * p < 0.05 and ** p < 0.01.