This study compared the percentage of severe pain scores reported by those without a TENS versus those with a TENS...

49% of people not using a TENS at 4cm dilated said their pain was severe

At the same time, only 20% of people using a TENS at 4cm dilated said their pain was severe

Findings: The mean of the severity of labor pain indicated a statistically significant difference after the intervention. The severity of pain indicated a statistically significant difference in the second stage of labor, and 4 hours after the labor in the groups. The duration of the first stage of labor was significantly different between the groups.

Conclusion: The application of transcutaneous electrical nerve stimulation affected pain relief in the first and second stages of labor and 4 hours after labor.