TABLE 3

Patient and Disease Characteristics in Children With Recent-Onset Arthritis

VariableJIA (n = 36)Infectious (n = 12)Postinfectious (n = 24)Transient (n = 109)Total (n = 181)
Female, n (%)21 (58)a3 (25)10 (42)34 (31)69 (38)
Age at inclusion, median (range), y5.9 (1.0–15.0)1.9 (0.0–13.0)b7.1 (1.0–14.0)c4.7 (0.0–15.0)4.9 (0.0–15.0)
White ethnicity, n (%)34 (94)11 (92)21 (88)99 (91)165 (91)
Onset in autumn or winter, n (%)22 (61)8 (67)18 (75)56 (51)105 (58)
Duration of symptoms before inclusion, median No. of days (1 and 3 quartiles)31 (6–114)b2 (0–29)3 (1–11)2 (1–5)3 (1–14)
Monarthritis, n (%)d23 (64)b12 (100)22 (92)90 (83)147 (81)
Oligoarthritis (2–4 joints), n (%)8 (22)0 (0)1 (4)17 (15)26 (14)
Polyarthritis (>4 ), n (%)5 (14)0 (0)1 (4)2 (2)8 (4)
  • a Data are versus infectious arthritis and transient arthritis (P < .05).

  • b Data are versus all of the other diagnostic groups (P < .05).

  • c Data are versus transient arthritis (P < .05).

  • d Data are within the first 6 weeks of follow-up.