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Table 1 Sociodemographic Characteristics of Study Population before Matching

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

 TMDNon-TMDOdds RatioStandardized difference
Patients (N)(%)Patients (N)(%)
Total12,3751.1a1,154,12998.9a  
Sex
 Male479238.7b556,88048.3b  
 Female758361.3597,24951.81.51 [1.45, 1.56]−0.193
Age
 20–29395832.0181,74215.7  
 30–39238619.3210,89218.30.52 [0.49, 0.54] 
 40–49202716.4241,73920.90.34 [0.32, 0.37] 
 50–59187915.2237,23220.60.31 [0.29, 0.34] 
 60–6911559.3149,39212.90.28 [,0.25, 0.31] 
 70 or older9707.8133,13211.50.24 [0.21, 0.27]0.388
Insurance type
 NHI12,07397.61,117,61096.8  
 Othersc3022.436,5193.20.88 [0.79, 0.99]0.298
Region
 Seoul311625.2252,30621.9  
 Capital area271221.9260,58222.60.87 [0.83, 0.92] 
 Metropolitan332326.9297,71825.80.94 [0.89, 0.99] 
 Rural areas322426.1343,52329.80.84 [0.80, 0.88]0.078
CCI
 0559845.2356,92830.9  
 1–2402332.5444,97338.61.14 [1.07, 1.22] 
 3–4197115.9258,92622.41.26 [1.13, 1.41] 
 5 or more7836.393,3028.11.53 [1.34, 1.75]0.298
  1. aDenominator: adults who are aged 20 years or older, N = 1,166,504
  2. bDenominator: total patients by each group, applies to all % below
  3. cOthers: beneficiaries, veterans
  4. TMD Temporomandibular Disorder; NHI Nathional Health Insurance, CCI Charlson Comorbidity Index