The main component of the SF-MPQ consists of 15 descriptive adjectives for the pain sensation (11 sensory and 4 affective), which are self-rated by the patient according to their intensity level on a point rating scale (0 = none, 1 = mild, 2 = moderate, 3 = severe). Three pain scores are derived from the sum of the intensity rank values of of the words chosen for sensory, affective and total descriptors. The sensory and affective scores are calculated by adding the sensory and affective intensity values.