Table 3.

Results of sub-analyses according to the biospecimen source and time of day.

Factor	SMD						Q
	Value	SE	Z value	p-value	CI.LB	CI.UB	df	Value	p-value
Source
Plasma	0.12	0.0583	2.0907	0.0366	0.0076	0.2361	18	13.2214	0.7783
Saliva	0.1179	0.0615	1.9182	0.0551	−0.0026	0.2384	8	7.872	0.446
Time of day
Morning	0.1363	0.0485	2.8088	0.005	0.0412	0.2314	21	16.6924	0.7296
Afternoon	0.0966	0.0716	1.348	0.1777	−0.0438	0.237	7	9.1638	0.2411