Factor N Facial pain
(n = 9,345)a 		Chronic facial pain
(n = 4,409)b
Prevalence (%) RR (95% CI)c Prevalence (%) RR (95% CI)c
Headache
No 397,478 0.89 1 0.38 1
Yes 103,010 5.64 6.01 (5.76, 6.27) 2.8 6.87 (6.45, 7.32)
Neck or shoulder pain
No 383,447 1.18 1 0.5 1
Yes 117,041 4.1 3.39 (3.25, 3.53) 2.12 4.12 (3.88, 4.37)
Back pain
No 370,352 1.42 1 0.62 1
Yes 130,136 3.13 2.23 (2.14, 2.32) 1.62 2.67 (2.51, 2.83)
Stomach pain
No 456,483 1.51 1 0.69 1
Yes 44,005 5.55 3.44 (3.29, 3.61) 2.91 3.97 (3.72, 4.24)
Hip pain
No 444,177 1.6 1 0.73 1
Yes 56,311 3.97 2.44 (2.33, 2.56) 2.1 2.82 (2.64, 3.02)
Knee pain
No 392,192 1.55 1 0.7 1
Yes 108,164 3.02 2.03 (1.94, 2.11) 1.55 2.31 (2.17, 2.45)

aFacial pain that interfered with participants’ usual activities.
bChronic facial pain was defined as facial pains for more than 3 months. 132 participants did not answer the question about chronicity and were excluded.
cAdjusted for age group and gender.
RR = relative risks.