TABLE 2

Annual Incidence of Recent-Onset Arthritis in Children <16 Years of Age According to Diagnostic Group and Gender

VariableTotalFemaleMaleP (Male vs Female)
No. of PatientsIncidence (95% CI)aNo. of PatientsIncidence (95% CI)aNo. of PatientsIncidence (95% CI)a
Total arthritis18271 (61–82)6955 (42–69)11386 (71–102).003
Chronic arthritis3714 (10–19)2218 (10–25)1511 (6–17)NS
    JIA3614 (10–19)2117 (10–24)1511 (6–17)NS
    SLE10.4 (0.0–1.0)11 (0–2)0NANA
Infectious arthritis125 (2–7)32 (0–5)118 (3–13)NS
    Septic arthritis83 (1–5)11 (0–2)75 (1–9)NS
    Osteomyelitis associated42 (0–3)22 (0–4)22 (0–4)NS
Postinfectious arthritis249 (6–14)108 (3–13)1411 (5–16)NS
    Rheumatic fever10.4 (0.0–1.0)0NA1NANS
    PSRA197 (4–11)86 (2–11)118 (3–13)NS
    Lyme31 (0–3)1NA2NANS
    Enterobacterial10.4 (0.0–1.0)1NA0NANS
Transient arthritis10943 (35–51)3427 (18–36)7557 (44–70).0001
    Idiopathic hip affection4818 (13–24)1210 (4–15)3627 (18–36).0001
    Idiopathic affection of other joints4417 (12–22)1411 (5–17)3023 (15–31)NS
    Henoch-Schönlein purpura145 (3–8)65 (1–9)86 (2–10)NS
    Urticaria20.8 (0.0–2.0)1NA1NANS
    Unspecific vasculitis10.4 (0.0–1.0)1NA0NANS
  • NA indicates not assessed; NS, not statistically significant; SLE, systemic lupus erythematosus.

  • a Data are per 100000 subjects.