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

Table 2 Depression and somatization classification

Classification	Normal	Moderate	Severe
Depression	< 0.535	≥ 0.535, ≤ 1.105	> 1.105
Nonspecific physical symptoms (including the painful symptoms)	< 0.500	≥ 0.500, ≤ 1.000	> 1.000
Nonspecific physical symptoms (excluding the painful symptoms)	< 0.428	≥ 0.428, ≤ 0.857	> 0.857

Table 3 Multiple regression analysis; the chronic pain grade scale by age, gender, depression, irritable bowel syndrome-symptom severity scale and irritable bowel syndrome subtypes

	Unstandardized coefficients		Standardized coefficients	t	Significance	95%CI
	β	SE	β			Lower	Upper
Constant	-0.220	0.530		-0.414	0.680	-1.274	0.834
Age	-0.007	0.007	-0.121	-1.124	0.264	-0.020	0.006
Gender	0.436	0.204	0.229	2.132	0.036	0.029	0.842
Depression	0.352	0.184	0.201	1.911	0.059	-0.014	0.718
IBS-SSS	-0.034	0.124	-0.290	-0.274	0.785	-0.280	0.213
IBS subtypes	0.032	0.109	0.031	0.292	0.771	-0.185	0.249

Dependent variable: Chronic pain grade scale. IBS: Irritable bowel syndrome.

Table 4 Multiple regression analysis; facial pain by age, gender, abdominal pain, depression, irritable bowel syndrome-symptom severity scale and irritable bowel syndrome subtypes

	Unstandardized coefficients		Standardized coefficients	t	Significance	95%CI
	β	SE	β			Lower	Upper
Costant	-0.891	0.720		-1.239	0.217	-2.314	0.531
Age	-0.001	0.012	-0.008	-0.104	0.917	-0.024	0.022
gender	0.292	0.338	0.071	0.866	0.388	-0.375	0.960
Abdominal pain VAS	0.220	0.083	0.396	2.644	0.009	0.056	0.384
IBS-SSS	-0.485	0.274	-0.329	-1.770	0.079	-1.026	0.057
Depression classification	0.473	0.189	0.205	2.501	0.014	0.099	0.848
Subtypes di IBS e HC	0.204	0.200	0.130	1.019	0.310	-0.191	0.598

Dependent variable: facial pain VAS (0-10). VAS: Visual analog scale; IBS: Irritable bowel syndrome; HC: Healthy controls.