Table 1.
The age distribution in baseline and follow-up time of systemic sclerosis patients and the controls
| 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 |
SD standard deviation; a:The total follow-up person-years