The relationship between spinal pain and temporomandibular joint disorders in Korea: a nationwide propensity score-matched study

Table 4 Prevalence of Spinal Pain for Each Level in Cases and Controls According to TMD Grade

	Total	Spinal grade 1^a		Spinal grade 2^b		Spinal grade 3^c		p-value^e
	Total	N	%^d	N	%^d	N	%^d	p-value^e
TMD total
Control	12,375	2806	22.7	614	5.0	807	6.5
Case	12,375	3525	28.5	1041	8.4	1398	11.3	<.0001
TMD grade 1^f
Control	10,951	2489	22.7	541	4.9	697	6.4
Case	10,951	3155	28.8	884	8.1	1084	9.9	<.0001
TMD grade 2^g
Control	910	210	23.1	39	4.3	72	7.9
Case	910	240	26.4	107	11.8	171	18.8	<.0001
TMD grade 3^h
Control	514	107	20.8	34	6.6	38	7.4
Case	514	130	25.3	50	9.7	143	27.8	<.0001
Difference test between TMD gradesⁱ								<.0001

^aSpinal pain grade 1: Outpatient days due to spinal pain, fewer than 6
^bSpinal pain grade 2: Outpatient days due to spinal pain, more than 6 and fewer than 12
^cSpinal pain grade 3: Outpatient days due to spinal pain, more than 12 or use of hospitalization services
^dDenominator: total TMD patients number or total case/control number by each grade
^eAnalysis of difference in spinal pain frequency according to TMD retention by using McNemar-Bowker test
^fTMD grade 1: Outpatient days due to TMD, fewer than 6 days
^gTMD grade 2: Outpatient days due to TMD more than 6 and fewer than 12
^hTMD grade 3: Outpatient days due to TMD more than 12 or use of hospitalization services
ⁱAnalysis of difference in each spinal pain grade frequency between each TMD grades by using Chi-square test
TMD Temporomandibular Disorder

ISSN: 1471-2474