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Table 1 Baseline demographics of patients with uveitis and matched control subjects

From: Recurrent anterior uveitis and subsequent incidence of ankylosing spondylitis: a nationwide cohort study from 2002 to 2013

  Control subjects (n = 52,415) All uveitis (n = 10,483) Recurrent uveitis (n = 2038) P value
Ankylosing spondylitis     < 0.001
 No 52,371 (99.9%) 10,426 (99.5%) 2017 (99.0%)  
 Yes 44 (0.08%) 57 (0.54%) 21 (1.03%)  
Sex     0.983
 Male 28,015 (53.4%) 5603 (53.4%) 1085 (53.2%)  
 Female 24,400 (46.6%) 4880 (46.6%) 953 (46.8%)  
Age at diagnosis (years)     < 0.001
 < 30 9030 (17.2%) 1806 (17.2%) 267 (13.1%)  
 30–39 7535 (14.4%) 1507 (14.4%) 360 (17.7%)  
 40–49 8980 (17.1%) 1796 (17.1%) 406 (19.9%)  
 50–59 8030 (15.3%) 1606 (15.3%) 350 (17.2%)  
 60–69 8380 (16.0%) 1676 (16.0%) 322 (15.8%)  
 ≥ 70 10,460 (20.0%) 2092 (20.0%) 333 (16.3%)  
Household income     > 0.999
 First quintile 8760 (16.7%) 1752 (16.7%) 350 (17.2%)  
 Second quintile 7510 (14.3%) 1502 (14.3%) 295 (14.5%)  
 Third quintile 9650 (18.4%) 1930 (18.4%) 369 (18.1%)  
 Fourth quintile 11,200 (21.4%) 2240 (21.4%) 437 (21.4%)  
 Fifth quintile (high) 15,295 (29.2%) 3059 (29.2%) 587 (28.8%)  
Year of diagnosis     < 0.001
 2004–2005 9020 (17.2%) 1804 (17.2%) 156 (7.67%)  
 2006–2007 8980 (17.1%) 1796 (17.1%) 313 (15.4%)  
 2008–2009 9920 (18.9%) 1984 (18.9%) 390 (19.2%)  
 2010–2011 12,440 (23.7%) 2488 (23.7%) 559 (27.5%)  
 2012–2013 12,055 (23.0%) 2411 (23.0%) 617 (30.3%)