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Table 3 Difference in demographics and pain related characteristics in subjects grouped by diffuse versus limited pain and further stratified by fulfilment of American College of Rheumatology fibromyalgia criteria (N = 579*)

From: The spectrum of pediatric amplified musculoskeletal pain syndrome

  Variables median (IQR) Limited pain Diffuse pain P-value
Meeting 2010 ACR Criteria for Fibromyalgia
(N = 222)
Denominator 23 199  
Age 15 (14–16) 15 (14–16) 0.65
Sex, Female n (%) 22 (96%) 172 (86%) 0.32
Duration of pain (months) 35 (24–60) 24 (10–48) 0.27
Current pain (0–10) 5 (3–6) 6 (4–8) 0.03
Most pain (0–10) 9 (8–10) 10 (9–10) 0.53
Least pain (0–10) 3 (1–5) 4 (2–6) 0.04
Patient FDI (0–60) 29 (16–33) 29 (20–36) 0.26
SSS 9 (7–10) 8 (6–10) 0.35
WPI 7 (5–8) 11 (9–16) <.0001
Not Meeting 2010 ACR Criteria for Fibromyalgia
(N = 357)
Denominator 244 113  
Age 13 (11–15) 14 (12–15) 0.35
Sex, Female n (%) 181 (74%) 89 (79%) 0.09
Duration of Pain (months) 12 (6–36) 14 (7–36) 0.10
Current pain (0–10) 5 (2–7) 5 (3–7) 0.19
Most pain (0–10) 9 (8–10) 10 (8–10) 0.06
Least pain (0–10) 3 (0–5) 3 (0–5) 0.13
Patient FDI (0–60) 19 (10–27) 18 (11–27) 0.31
SSS 4 (2–6) 4 (3–6) 0.16
WPI 1 (1–3) 7 (4–9) <.0001
  1. Missing data: current pain (1), most pain (2), least pain (2), FDI patient (9), FDI parent (10)
  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