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

Table 1 Sociodemographic Characteristics of Study Population before Matching

	TMD		Non-TMD		Odds Ratio	Standardized difference
	Patients (N)	(%)	Patients (N)	(%)	Odds Ratio	Standardized difference
Total	12,375	1.1^a	1,154,129	98.9^a
Sex
Male	4792	38.7^b	556,880	48.3^b
Female	7583	61.3	597,249	51.8	1.51 [1.45, 1.56]	−0.193
Age
20–29	3958	32.0	181,742	15.7
30–39	2386	19.3	210,892	18.3	0.52 [0.49, 0.54]
40–49	2027	16.4	241,739	20.9	0.34 [0.32, 0.37]
50–59	1879	15.2	237,232	20.6	0.31 [0.29, 0.34]
60–69	1155	9.3	149,392	12.9	0.28 [,0.25, 0.31]
70 or older	970	7.8	133,132	11.5	0.24 [0.21, 0.27]	0.388
Insurance type
NHI	12,073	97.6	1,117,610	96.8
Others^c	302	2.4	36,519	3.2	0.88 [0.79, 0.99]	0.298
Region
Seoul	3116	25.2	252,306	21.9
Capital area	2712	21.9	260,582	22.6	0.87 [0.83, 0.92]
Metropolitan	3323	26.9	297,718	25.8	0.94 [0.89, 0.99]
Rural areas	3224	26.1	343,523	29.8	0.84 [0.80, 0.88]	0.078
CCI
0	5598	45.2	356,928	30.9
1–2	4023	32.5	444,973	38.6	1.14 [1.07, 1.22]
3–4	1971	15.9	258,926	22.4	1.26 [1.13, 1.41]
5 or more	783	6.3	93,302	8.1	1.53 [1.34, 1.75]	0.298

^aDenominator: adults who are aged 20 years or older, N = 1,166,504
^bDenominator: total patients by each group, applies to all % below
^cOthers: beneficiaries, veterans
TMD Temporomandibular Disorder; NHI Nathional Health Insurance, CCI Charlson Comorbidity Index

ISSN: 1471-2474