Table 1. Plasma melatonin concentration in rats on day 35.

Rat groups	Naïve ZDF	ZDF-taVNS	Naïve ZL	ZL-taVNS
Mean	3.273	4.712	3.458	4.2
Standard deviation (SD)	0.385	0.459	0.271	0.999
Sample size (N)	6	8	8	6
Std. error of mean(SEM)	0.157	0.162	0.096	0.408
Lower 95% conf. limit	2.869	4.328	3.231	3.151
Upper 95% conf. limit	3.678	5.095	3.685	5.249
P value vs. Naïve ZDF (Tukey-Kramer)		<0.001	= 0.930	= 0.043
DF	3
Residual	24
F	10.050