Table 4 Model Statistics assessing the association between Fibromyalgia (FMS) and blood serum C-reactive Protein (CRP) quartile adjusting for Sleep impairment and Mood disturbance in a US adult population, 2005–2006 (N = 52,535)

CRP level (mg/L)

1.02 (1.01–1.02) (<.0001^*)

1.01 (1.00–1.01) (.004^*)

1.01 (1.00–1.01) (.021^*)

1.01 (1.00–1.01) (.035^*)

1.01 (1.00–1.01) (.031^*)

CRP Quartile 1^a (ref)

—

—

—

—

—

 Quartile 2^b

1.33 (1.09–1.62) (.004^*)

1.13 (0.92–1.38) (.243)

1.12 (0.91–1.36) (.287)

1.10 (0.90–1.35) (.357)

1.10 (0.90–1.34) (.363)

 Quartile 3^c

1.78 (1.48–2.14) (<.0001^*)

1.23 (1.02–1.48) (.032^*)

1.20 (1.00–1.45) (.056)

1.18 (0.98–1.43) (.083)

1.18 (0.97–1.42) (.093)

 Quartile 4^d

2.50 (2.10–2.97) (<.0001^*)

1.35 (1.13–1.62) (.0009^*)

1.28 (1.07–1.53) (.007^*)

1.26 (1.05–1.51) (.011^*)

1.24 (1.03–1.48) (.021^*)

Wald X², p for trend^t

118.42, (<.0001*)

17.48, (<.0001*)

11.06, (.0009*)

10.40, (.001*)

8.25, (.004*)