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

Table 5 Medical Expenditure, Number of Visits, and Length of Treatment for Spinal Pain in Cases and Controls by TMD grade

	Average		t Value^a	Pr > \|t\|
	Control	Case	t Value^a	Pr > \|t\|
Medical expenditure ($)^b
TMD total	81	136	10.34	<.0001
TMD grade 1^c	78	122	8.62	<.0001
TMD grade 2^d	96	201	4.61	<.0001
TMD grade 3^e	106	320	3.77	0.0002
Difference test between TMD grades^g			95.81	<.0001
Number of visits (days)^f
TMD total	2.7	4.8	14.21	<.0001
TMD grade 1^c	2.6	4.2	11.25	<.0001
TMD grade 2^d	3.5	7.8	6.50	<.0001
TMD grade 3^e	3.5	11.3	6.29	<.0001
Difference test between TMD grades			97.51	<.0001
Lengths of treatment (days)^g
TMD total	3.3	5.5	10.95	<.0001
TMD grade 1^c	3.1	4.9	8.95	<.0001
TMD grade 2^d	3.7	8.6	6.47	<.0001
TMD grade 3^e	5.3	12.3	3.48	0.0005
Difference test between TMD grades			96.82	<.0001

^aResults of paired t test
^bConverted costs according to the U.S. Dollar in 2018.10.12 (US $1.00 = Korean 1130 Won)
^cTMD grade 1: Outpatient days due to TMD fewer than 6
^dTMD grade 2: Outpatient days due to TMD more than 6 and fewer than 12
^eTMD grade 3: Outpatient days due to TMD more than 12 or use of hospitalization services
^fNumber of visits: Number of outpatient visits or number of inpatient care days of patients
^gLengths of treatment: Total days of treatment, including drug prescription days without medical treatment
^hOutcome difference test between TMD grades by using Kruskal–Wallis test
TMD Temporomandibular Disorder

ISSN: 1471-2474