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Table 2 Characteristics of the study cohort, stratified by juvenile arthritis (JA) case status

From: A population‐based study to develop juvenile arthritis case definitions for administrative health data using model‐based dynamic classification

Characteristic JA Cases
(n = 386)
Non-JA Controls
(n = 411)
 
  n (%) n (%) P-value*
Sex
 Male 134 (34.7) 145 (35.3) 0.87
 Female 252 (65.3) 266 (64.7)
Age at diagnosis (years)
 0–5 146 (37.8) 102 (24.8) < 0.01
 6–10 82 (21.2) 118 (28.7)
 11–15 158 (40.9) 191 (46.5)
Period of diagnosis
 ≤ 1992 83 (21.5) 6 (1.5) < 0.01
 1993–2002 192 (49.7) 326 (79.3)
 2003–2012 111 (28.8) 79 (19.2)
Region of residence
 Urban 218 (56.5) 238 (57.9) 0.68
 Rural 168 (43.5) 173 (42.1)
Income quintile
 Q1 (Lowest/Not Found) 83 (21.5) 102 (24.8) 0.48
 Q2 68 (17.6) 77 (18.7)
 Q3 80 (20.7) 67 (16.3)
 Q4 81 (21.0) 91 (22.1)
 Q5 (Highest) 74 (19.2) 74 (18.0)
Any JA-related visit
 0–2 years 54 (14.0) 8 (1.9) < 0.01
 8 years 154 (39.9) 21 (5.1) < 0.01
 15 years 249 (64.5) 37 (9.0) < 0.01
Number of general practitioner visits*
 0–2 years 10.51 (9.98) 9.35 (10.28) 0.11
 8 years 1.64 (2.29) 1.86 (2.69) 0.22
 15 years 2.17 (2.95) 2.05 (2.80) 0.56
Number of specialist visits*
 0–2 years 10.02 (11.38) 10.51 (11.33) 0.54
 8 years 3.97 (4.86) 2.87 (4.89) < 0.01
 15 years 3.89 (4.10) 4.27 (5.98) 0.30
Hospitalization
 0–2 years 114 (29.5) 137 (33.3) 0.25
 8 years 23 (6.0) 36 (8.8) 0.13
 15 years 36 (9.3) 69 (16.8) < 0.01
  1. *Reported as mean (standard deviation); all other characteristics are reported as frequency (%)