High risk of temporomandibular disorder in irritable bowel syndrome: Is there a correlation with greater illness severity?

Table 1 Chronic pain grade classification

Grade 0
Low disability	No TMD pain in prior 6 mo
Grade I
Low intensity	Characteristic pain intensity < 50, and less than 3 disability points
Grade II
High intensity	Characteristic pain intensity ≥ 50, and less than 3 disability points
High disability
Grade III
Moderately limiting	3 to 4 disability points, regardless of characteristic pain intensity
Grade IV
Severely limiting	5 to 6 disability points regardless of characteristic pain intensity