a trend toward significanceP =0.06
Facial expressions of pain (STEP test) Differences were mainly observed in the P[A]NM score (between faces expressing “moderate pain” and those expressing “no pain”) ( F [3,64] =3.09) ( P =0.03), and significant differences were found between the FM patients and the controls ( P =0.01), between the MS-P patients and the controls ( P =0.03), and with a trend toward significance between the MS-NP patients and the controls ( P =0.06).