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Table 2 Sociodemographic Characteristics of Study Population after Propensity Score Matching

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

 TMDNon-TMD 
Patients (N)(%)Patients (N)(%)Standardized differences
Total12,375 12,375  
Sex
 Male479238.7a479238.7a 
 Female758361.3758361.30.000
Age
 20–29395832.0395832.0 
 30–39238619.3238619.3 
 40–49202716.4202716.4 
 50–59187915.2187915.2 
 60–6911559.311559.3 
 70 or older9707.89707.80.000
Insurance type
 NHI12,07397.612,07397.6 
 othersb3022.43022.40.000
Region
 Seoul311625.2311625.2 
 Capital area271221.9271221.9 
 Metropolitan332326.9332326.9 
 Rural areas322426.1322426.10.000
CCI
 0559845.2559845.2 
 1–2402332.5402332.5 
 3–4197115.9197115.9 
 5 or more7836.37836.30.000
  1. aDenominator: total patients by each group, applies to all % below
  2. bOthers: beneficiaries, veterans
  3. TMD Temporomandibular Disorder, NHI National Health Insurance, CCI Charlson Comorbidity Index