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

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

 TotalSpinal grade 1aSpinal grade 2bSpinal grade 3cp-valuee
N%dN%dN%d
TMD total
 Control12,375280622.76145.08076.5 
 Case12,375352528.510418.4139811.3<.0001
TMD grade 1f
 Control10,951248922.75414.96976.4 
 Case10,951315528.88848.110849.9<.0001
TMD grade 2g
 Control91021023.1394.3727.9 
 Case91024026.410711.817118.8<.0001
TMD grade 3h
 Control51410720.8346.6387.4 
 Case51413025.3509.714327.8<.0001
Difference test between TMD gradesi     <.0001
  1. aSpinal pain grade 1: Outpatient days due to spinal pain, fewer than 6
  2. bSpinal pain grade 2: Outpatient days due to spinal pain, more than 6 and fewer than 12
  3. cSpinal pain grade 3: Outpatient days due to spinal pain, more than 12 or use of hospitalization services
  4. dDenominator: total TMD patients number or total case/control number by each grade
  5. eAnalysis of difference in spinal pain frequency according to TMD retention by using McNemar-Bowker test
  6. fTMD grade 1: Outpatient days due to TMD, fewer than 6 days
  7. gTMD grade 2: Outpatient days due to TMD more than 6 and fewer than 12
  8. hTMD grade 3: Outpatient days due to TMD more than 12 or use of hospitalization services
  9. iAnalysis of difference in each spinal pain grade frequency between each TMD grades by using Chi-square test
  10. TMD Temporomandibular Disorder