International Journal of Photoenergy / 2012 / Article / Fig 5

Research Article

Inhibitory Effects of Far-Infrared Ray-Emitting Belts on Primary Dysmenorrhea

Figure 5

The mean SDNN values before and after treatment. Expression values are the mean and standard deviation, and Wilcoxon Signed-Rank Test was used to test the statistical difference between groups. Asterisk means that this group has statistical difference with control group ( ).