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Table 2 Demographics and pain related characteristics in population with amplified pain stratified by whether or not the groups meet American College of Rheumatology adult fibromyalgia criteria (1)(N = 579*)

From: The spectrum of pediatric amplified musculoskeletal pain syndrome

Variables median (IQR) Meet ACR fibromyalgia criteria P-value
Yes (N = 222) No (N = 357)
Age 15 (14–16) 13 (11–15) <.0001
Female sex 194 (87%) 270 (76%) <.001
Number of Painful Body Parts 10 (6–12) 3 (2–5) <.0001
Duration of pain (months) 24 (12–48) 12 (7–36) <.001
Current pain (scored 0–10) 6 (4–8) 5 (2–7) <.0001
Most pain (scored 0–10) 10 (9–10) 9 (8–10) <.01
Least pain (scored 0–10) 4 (2–6) 3 (0–5) <.0001
Patient FDI (scored 0–60) 29 (20–35) 19 (10–27) <.0001
SSS (scored 0–12) 8 (6–10) 4 (2–6) <.0001
WPI (scored 0–19) 11 (8–15) 2 (1–5) <.0001
  1. Missing data: current pain (1), most pain (2), least pain (2), FDI patient (9), FDI parent (10), pain duration (1)
  2. Abbreviations: N number of subjects, IQR Interquartile Range, FDI Functional Disability Index, WPI Widespread Pain Index, SSS Symptom Severity Score
  3. *Missing data on 2010 American College of Rheumatology fibromyalgia criteria on 57 subjects due to missing data on WPI and SSS
  4. Based on 2010 American College of Rheumatology fibromyalgia criteria, subjects are categorized into two groups – meet the criteria if their WPI ≥ 7 and SSS ≥ 5 or WPI 3–6 and SSS ≥ 9, symptoms present for at least 3 months and absence of a disorder that explains the pain; and not meeting the criteria if not meet any of these conditions
  5. P-value statistically significant if < 0.05