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Table 1 The age distribution in baseline and follow-up time of systemic sclerosis patients and the controls

From: Reduced incidence of Crohn’s disease in systemic sclerosis: a nationwide population study

  Systemic sclerosis   Controls  
  (n = 2829)   (n = 8257)  
Age(years; mean ± SD) 49.27 ± 14.63   49.44 ± 14.57  
Age group at enrollment(years) n (%) Person-yearsa n (%) Person-years
> = 20, <30 315 (11.13) 2105.67 897 (10.86) 6676.17
> = 30, <40 459 (16.22) 3596.42 1301 (15.76) 11209.67
> = 40, <50 697 (24.64) 5448.33 2067 (25.03) 18276.25
> = 50, <60 681 (24.07) 4562.83 1975 (23.92) 15573.33
> = 60, <70 427 (15.09) 2607.00 1294 (15.67) 9607.75
> = 70, <80 220 (7.78) 1161.83 636 (7.70) 4753.08
> = 80 30 (1.06) 118.67 87 (1.05) 532.50
  1. SD standard deviation; a:The total follow-up person-years