Table 1.
Demographics and other comorbidity characteristics of three study groups
| (a) Headache without TMD (n=349) |
(b) Headache comorbid with TMD (n=147) |
(c) Headache attributed to TMD (n=123) |
p-values | ||
|---|---|---|---|---|---|
| Avg of c,b vs. a |
c vs. b | ||||
| Demographic characteristic | |||||
| Age: mean (IQR) years | 38.3 (30–46) | 38.5 (28–47) | 37.4 (28–46) | 0.380 | 0.690 |
| Gender: % female | 68.2 | 69.4 | 84.6 | 0.001 | 0.004 |
| Race: % white | 62.2 | 68.7 | 74.8 | 0.010 | 0.270 |
| Overlapping pain conditions (%) | |||||
| Irritable Bowel Syndrome | 20.8 | 39.3 | 39.8 | 0.000 | 0.930 |
| Low back pain | 19.0 | 37.2 | 34.8 | 0.001 | 0.680 |
| Fibromyalgia | 2.6 | 17.2 | 26.3 | 0.000 | 0.080 |
| Competing classifications for headache (%) * | |||||
| Cervicogenic headache | 22.5 | 47.6 | 64.4 | 0.000 | 0.007 |
| Rhinosinusitis headache | 5.0 | 16.7 | 17.8 | 0.000 | 0.810 |
| Post-traumatic headache | 4.4 | 11.1 | 15.3 | 0.000 | 0.320 |
| Primary headache type (%) ** | |||||
| Migraine without TTH | 10.3 | 15.7 | 21.1 | 0.000 | 0.070 |
| TTH without migraine | 68.5 | 53.1 | 39.0 | ||
| Both migraine and TTH | 21.2 | 31.3 | 39.8 | 0.000 | 0.050 |
*
Not mutually exclusive
**
Mutually exclusive; χ2 (4 df) = 34.2, p<0.0001; TTH: tension-type headache