Comparison between Pupil Size in the Control and TMD Groups in the Yellow-Green Light Condition.

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 = 0.003.**paired t test within groups between the pre-TENS and post-TENS conditions in the control group: p = 0.0005.°unpaired t test between the groups before TENS: p = 0.001.°°unpaired t test between the groups during TENS: p = 0.02.Comparison between Pupil Size in the Control and TMD Groups in the Yellow-Green Light Condition.