Table 2.

Analysis of variance results for the time courses of salivary melatonin secretion

	p value	F value(df)	Partial η 2 value
Main effect of TRP	.139	2.55(1, 11)	.188
Main effect of light	.099	3.25(1, 11)	.228
Main effect of time	<.001	25.62(1.81, 19.93) a	.700
Interaction between TRP and light	.391	0.80(1, 11)	.068
Interaction between TRP and time	.111	2.49(1.85, 20.36) a	.184
Interaction between light and time	.118	2.09(3.08, 33.90) a	.160
Interactions between TRP, light, and time	.342	1.16(4.05, 44.54) a	.095

^aThe degrees of freedom were modified using the Greenhouse–Geisser method because the assumption of sphericity was not met

TRP tryptophan