Skip to main content

Table 1 Baseline characteristics of the arthralgia patients

From: Reappraisal of the diagnostic and prognostic value of morning stiffness in arthralgia and early arthritis: results from the Groningen EARC, Leiden EARC, ESPOIR, Leiden EAC and REACH

  Leiden EA R C Groningen EA R C REACH
All n = 807 No arthritis n = 435 Arthritis n = 372 All n = 481 No arthritis n = 214 Arthritis n = 267 All n = 353 No arthritis n = 172 Arthritis n = 181
Age, mean ± SD, years 51.4 ± 16.3 49.6 ± 15.5 53.5 ± 17.0 51.6 ± 16.4 49.0 ± 15.3 53.7 ± 16.9 48.6 ± 14.1 46.7 ± 11.7 50.3 ± 15.9
Female, n (%) 574 (71) 345 (79) 229 (62) 311 (65) 145 (68) 166 (62) 277 (79) 149 (87) 128 (71)
Gradual onset symptoms, n (%) 499 (62) 285 (67) 214 (59) 299 (63) 140 (66) 159 (61) 183 (58) 115 (71) 68 (44)
Morning stiffness, minutes 10 (0–30) 10 (0–30) 10 (0–30) 10 (0–30) 10 (0–30) 15 (0–60) 30 (0–60) 30 (0–60) 30 (0–97)
≥30 minutes, n (%) 210 (30) 106 (28) 104 (32) 146 (36) 55 (30) 91 (40) 185 (53) 87 (52) 98 (54)
≥60 minutes, n (%) 129 (18) 60 (16) 69 (21) 88 (22) 27 (15) 61 (27) 114 (32) 45 (27) 68 (38)
≥90 minutes, n (%) 71 (10) 27 (7) 44 (14) 53 (13) 15 (8) 38 (17) 73 (21) 25 (15) 48 (27)
Tender joint count 7 (2–14) 8 (3–17) 5 (2–13) 9 (4–18) 9 (4–18) 8 (3–18) 7 (3–12) 7 (2–12) 7 (3–11)
Symptom duration, weeks 11.5 (4.0-61.0) 19.3 (6.1-122) 6.9 (2.7-21.6) 18.0 (5.6-64.3) 22.9 (6.9-74.9) 16.6 (4.6-54.9) 1.7 (0.8-3.2) 2.4 (1.2-3.6) 1.3 (0.7-2.3)
<12 weeks symptom duration, n (%) 380 (51) 162 (41) 218 (62) 165 (39) 70 (38) 95 (39) 352 (100) 171 (100) 181 (100)
  1. Values are median (interquartile range) unless indicated otherwise. Missingness per variable as follows: gradual onset symptoms (defined as start of onset >1 week) Leiden EARC n = 17, Groningen EARC n = 8, REACH n = 36); morning stiffness Leiden EARC n = 101, Groningen EARC n = 72, REACH n = 5; tender joint count Groningen EARC n = 1; symptom duration/ <12 weeks symptom duration Leiden EARC n = 61, Groningen EARC n = 54, REACH n = 1. Patients with missing data on morning stiffness duration did not differ significantly from patients with data on morning stiffness (data not shown). EARC, Early Arthritis Recognition Clinic; REACH, Rotterdam Early Arthritis Cohort; SD, standard deviation.
\