Table 1.

Group Characteristics. (mean ±SD)

Group	n	Age	Sex (female)	CRP (mg/L)	Sleep score
Chronic pain -initial assessment cohort	17642	56.24 ± 8.04	8586 (48.7%)	2.18 ± 3.73	3.23 ± 0.94
Acute pain -initial assessment cohort	11962	55.08 ± 8.21	5348 (44.7%)	2.04 ± 3.45	3.32 ± 0.95
Pain-free controls -- initial assessment cohort	29604	55.77 ± 8.13	13934 (47.1%)	1.95 ± 3.42	3.39 ± 0.94
Chronic pain – second visit assessment cohort	669	61.10 ± 7.40	303 (45.3%)	2.26 ± 4.98	3.25 ± 0.98
Acute pain – second visit assessment cohort	494	60.08 ± 7.84	207 (41.9%)	2.07 ± 4.56	3.30 ± 0.91
Pain-free controls – second visit assessment cohort	1163	60.67 ± 7.60	510 (43.9%)	1.85 ± 3.99	3.38 ± 0.91