three groups of subjects ( common migraine , tension headache and non-headache ) were given a single questionnaire in which five oral habits ( i.e . teeth clenching , jaw jutting , cupping the chin in the hand , and resting the right and left side of the face on the hand ) were rated on a 0 ( not at all ) to 10 ( almost always ) scale .
C0033893
tension headache
C0018681
headache