Table 1.
Background characteristics of children in the study population.
| DM (N = 101) | AIT (N = 63) | JIA (N = 52) | IBD (N = 26) | Casesa (N = 242) | Matched controlsb (N = 2,147) | |
|---|---|---|---|---|---|---|
| Age at the end of follow-up (years), mean ± SD | 16.5 ± 1.6 | 17.1 ± 1.1 | 16.7 ± 1.3 | 16.7 ± 1.2 | 16.7 ± 1.4 | 16.7 ± 1.4 |
| Sex, n (%) | ||||||
| Girl | 41 (40.6) | 44 (69.8) | 42 (80.8 | 13 (50.0) | 140 (57.9) | 1,222 (56.9) |
| Boy | 60 (59.4) | 19 (30.2) | 10 (19.2) | 13 (50.0) | 102 (42.1) | 925 (43.1) |
| Residential area, n (%) | ||||||
| Capital (South) | 33 (32.7) | 18 (28.6) | 10 (19.2) | 10 (38.5) | 71 (29.3) | 635 (29.6) |
| Inner South | 6 (5.9) | 7 (11.1) | 13 (25.0) | 4 (15.4) | 30 (12.4) | 262 (12.2) |
| West | 9 (8.9) | 16 (25.4) | 10 (19.2) | 2 (7.7) | 37 (15.3) | 287 (13.4) |
| East | 33 (32.7) | 16 (25.4) | 9 (17.3) | 5 (19.2) | 63 (26.0) | 569 (26.5) |
| North | 20 (19.8) | 6 (9.5) | 10 (19.2) | 5 (19.2) | 41 (16.9) | 394 (18.4) |
| Median age of diagnosis, years (IQR) | 8.7 (4.8–12.0) | 14.1 (10.0–16.1) | 10.3 (4.4–13.1) | 11.8 (9.5–13.6) | 11.0 (6.0–13.8) | |
a
Cases = children with autoimmune diseases (represented with DM (type 1 diabetes mellitus), AIT (autoimmune thyroiditis), JIA (juvenile idiopathic arthritis), and IBD (inflammatory bowel diseases)).
b
Each child in the case group were matched with four to ten children with similar age, sex, and residential area.