TABLE 1.
Demographic data between patients with seborrheic dermatitis and controls
| Characteristics | With seborrheic dermatitis (n = 7831) | Controls (n = 31 324) | P |
|---|---|---|---|
| Mean age at enrolled (SD), years | 33.1 (9.0) | 33.3 (9.1) | 0.1339 |
| Age subgroup, n (%) | |||
| 18–29 | 3334 (42.57) | 13 336 (42.57) | 1.000 |
| 30–39 | 2327 (29.72) | 9308 (29.72) | |
| 40–49 | 2170 (27.71) | 8680 (27.71) | |
| Gender, n (%) | |||
| Males | 3623 (46.26) | 14 492 (46.26) | 1.000 |
| Females | 4208 (53.74) | 16 832 (53.74) | |
| Charlson Comorbidity Index, n (%) | |||
| 0 | 2307 (29.46) | 9228 (29.46) | 1.000 |
| 1–2 | 3725 (47.57) | 14 900 (47.57) | |
| 3–4 | 1292 (16.50) | 5168 (16.50) | |
| ≥5 | 507 (6.47) | 2028 (6.47) | |
| Comorbidity, n (%) | |||
| Diabetes mellitus | 759 (9.69) | 2402 (7.67) | <0.001 |
| Hyperlipidemia | 1628 (20.79) | 4525 (14.45) | <0.001 |
| Hypertension | 1110 (14.17) | 2991 (9.55) | <0.001 |
| Hyperthyroidism | 556 (7.10) | 1529 (4.88) | <0.001 |
| Chronic liver disease | 2367 (30.23) | 8175 (26.10) | <0.001 |
| Chronic kidney disease | 445 (5.68) | 1738 (5.55) | 0.644 |
| Chronic pulmonary disease | 2559 (32.68) | 10 496 (33.51) | 0.163 |
| Depression | 960 (12.26) | 2543 (8.12) | <0.001 |
| Stroke | 165 (2.11) | 472 (1.51) | <0.001 |
| Epilepsy | 133 (1.70) | 523 (1.67) | 0.859 |
| Dementia | 41 (0.52) | 78 (0.25) | <0.001 |
| Psoriasis | 670 (8.56) | 299 (0.95) | <0.001 |
Abbreviation: SD, standard deviation.