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Table 1 Demographic characteristics of chronic TMD patients compared to healthy controls

From: Poorer sleep quality in patients with chronic temporomandibular disorders compared to healthy controls

  Chronic TMD patients (n = 503) Healthy control (n = 180) p-value
Parameter n (%) or Mean ± SD n (%) or Mean ± SD  
Age (years)a 33.10 ± 13.26 32.77 ± 12.95 0.771
Age groups < 0.001***
10s < 20s < 30s < over 40
 Under 20 years old (10s) b 61 (17.59 ± 2.28) 20 (17.60 ± 1.56)
 20–30 years old (20s) 208 (24.58 ± 2.86) 77 (24.43 ± 2.61)
 31–40 years old (30s) 93 (34.46 ± 3.09) 35 (34.03 ± 3.00)
 More than 40 years old (over 40) 141 (51.49 ± 7.41) 48 (51.55 ± 6.87)
Sex (Female %)c 333 (66.2) 116 (64.4) 0.367
BMI (kg/m2)a 22.32 ± 3.57 21.45 ± 2.76 0.001**
VAS 4.89 ± 2.45 n.a.
Symptom duration (days) 589.74 ± 1315.01 n.a.
  1. TMD temporomandibular disorder, BMI body mass index, SD standard deviation, n.a. not available
  2. A p-value < 0.05 was considered significant.**: p-value <0.01. ***: p-value <0.001
  3. a: The results were obtained via t- test, b : The mean difference among age subgroups was obtained by one-way analysis of variance and post-hoc analysis. c: The results were obtained from χ2 test