Comparison of the Pupil Size and Yellow-Green/Infrared Light (L/D) Ratio between the Control and TMD Groups.

The data are expressed as means and standard deviations (in parentheses). Asterisks and circles show the statistically significant differences.*paired t test within groups between the pre-TENS and TENS conditions in the control group: p = 0.03.**paired t test within groups between the pre-TENS and post-TENS conditions in the control group: p = 0.01.°unpaired t test between the groups before TENS: p = 0.0002.°°unpaired t test between the groups during TENS: p = 0.01.Comparison of the Pupil Size and Yellow-Green/Infrared Light (L/D) Ratio between the Control and TMD Groups.