Table 3.

Basal rhythm (R0) and fly-back rhythm (R1) salivary cortisol levels (data expressed as mean ± SD)

No. of sample	Time of sample	Basal salivary cortisol rhythm (R0) (nmol/L)	Fly-back cortisol rhythm (R1) (nmol/L)	p
1	11 p.m. day 0	1.38 ± 0.00	4.82 ± 6.73	0.0099
2	8 a.m. day 1	17.25 ± 3.42	4.11 ± 3.93	<0.000
3	12 a.m. day 1	3.05 ± 1.07	7.37 ± 6.80	0.0016
4	11 p.m. day 1	1.46 ± 0.22	3.78 ± 4.35	0.0079

Student t-test comparing R0 and R1 showed significant differences for each time of sample (reported as sample ns. 1, 2, 3, and 4) (significance for p < 0.05)

In bold, p-values < 0.05.