highly significantp = .004
In addition, the children of the MIPAS-Family group reported highly significant reductions of the headache frequencies (Pre–Post 1: z = −2.841, p = .004; Pre–Post 2: z = −3.126, p = .002), whereas the children of the Biofeedback group only showed a significant improvement for the Pre–Post 1 comparison ( z = −2.333, p = .02).