Fig. 2

Efficacy comparison of pain responses in a single attack. a Pain relief at 2 h post-treatment of REN (solid black and diagonal black) compared with usual care (solid gray) and pharmacological treatment (diagonal gray). b Pain-free at 2 h post-treatment of REN (solid black and diagonal black) compared with usual care (solid gray) and pharmacological treatment (diagonal gray). *p < 0.05