Table 1.
Skin Disease Incidence and Prevalence, 2002–2006, per 1,000 Patient-Years, by Age and Sex
| Skin Disease | Total | Male Total | Female Total | Male 0–4 y | Female 0–4 y | Male 5–14 y | Female 5–14 y | Male 15–24 y | Female 15–24 y | Male 25–44 y | Female 25–44 y | Male 45–64 y | Female 45–64 y | Male 65–74 y | Female 65–74 y | Male ≥75 y | Female ≥75 y |
| Acne vulgaris | |||||||||||||||||
| Incidence | 3.2 | 2.4 | 4.1 | 0.4 | 0.4 | 5.6 | 6.6 | 13.3 | 17.3 | 0.9 | 4.9 | 0.0 | 0.0 | 0.0 | 0.4 | 1.5 | 0.0 |
| Prevalence | 9.6 | 5.4 | 13.7 | 0.4 | 0.4 | 7.2 | 8.6 | 35.0 | 66.9 | 3.0 | 18.8 | 0.2 | 1.7 | 0.0 | 0.4 | 1.5 | 0.0 |
| Atopic dermatitis | |||||||||||||||||
| Incidence | 6.1 | 6.5 | 5.7 | 56.4 | 40.4 | 7.4 | 6.2 | 2.5 | 8.4 | 2.0 | 2.7 | 0.9 | 1.7 | 0.4 | 1.1 | 0.7 | 0.4 |
| Prevalence | 24.8 | 23.8 | 25.7 | 108.9 | 77.8 | 49.9 | 35.0 | 18.7 | 40.6 | 11.9 | 22.8 | 7.6 | 11.0 | 11.3 | 18.2 | 10.4 | 11.3 |
| Benign neoplasm | |||||||||||||||||
| Incidence | 17.5 | 14.0 | 20.8 | 1.2 | 1.7 | 2.5 | 4.4 | 7.9 | 16.1 | 18.4 | 25.5 | 19.3 | 32.1 | 17.9 | 23.4 | 14.2 | 11.3 |
| Prevalence | 17.6 | 14.0 | 21.0 | 1.2 | 1.7 | 2.5 | 4.4 | 7.9 | 16.1 | 18.4 | 25.5 | 19.3 | 32.4 | 17.9 | 24.4 | 14.2 | 11.3 |
| Chronic ulcer | |||||||||||||||||
| Incidence | 2.1 | 1.7 | 2.5 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.5 | 0.3 | 1.5 | 1.0 | 5.0 | 3.6 | 18.7 | 27.9 |
| Prevalence | 2.5 | 2.2 | 2.8 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.6 | 0.3 | 1.8 | 1.0 | 5.8 | 3.6 | 27.6 | 32.7 |
| Contact dermatitis | |||||||||||||||||
| Incidence | 2.5 | 1.5 | 3.5 | 0.4 | 0.8 | 1.1 | 1.3 | 2.2 | 7.1 | 1.8 | 4.3 | 1.2 | 4.0 | 0.8 | 2.5 | 3.7 | 1.3 |
| Prevalence | 4.0 | 2.2 | 5.8 | 0.4 | 0.8 | 1.1 | 1.5 | 3.2 | 8.7 | 2.3 | 7.0 | 2.4 | 7.7 | 2.9 | 3.6 | 3.7 | 4.4 |
| Corns | |||||||||||||||||
| Incidence | 3.9 | 3.4 | 4.4 | 0.4 | 0.0 | 0.4 | 0.7 | 2.2 | 2.2 | 3.9 | 4.0 | 4.1 | 5.5 | 5.0 | 8.4 | 10.4 | 13.1 |
| Prevalence | 4.0 | 3.4 | 4.5 | 0.4 | 0.0 | 0.4 | 0.7 | 2.2 | 2.2 | 3.9 | 4.2 | 4.1 | 5.5 | 5.0 | 8.4 | 10.4 | 13.1 |
| Dermatitis | |||||||||||||||||
| Incidence | 53.9 | 44.0 | 63.4 | 62.7 | 61.0 | 31.2 | 41.0 | 30.2 | 65.3 | 35.0 | 59.3 | 45.2 | 66.5 | 67.1 | 82.9 | 100.7 | 92.0 |
| Prevalence | 64.7 | 53.4 | 75.3 | 64.3 | 61.4 | 32.6 | 43.2 | 31.5 | 75.5 | 42.1 | 67.0 | 57.6 | 84.5 | 89.6 | 106.5 | 147.7 | 119.9 |
| Diseases of the hair | |||||||||||||||||
| Incidence | 1.5 | 0.8 | 2.1 | 0.4 | 0.0 | 0.7 | 1.3 | 0.6 | 2.2 | 1.1 | 3.3 | 0.9 | 2.3 | 0.0 | 0.7 | 0.7 | 0.9 |
| Prevalence | 2.5 | 1.4 | 3.7 | 0.4 | 0.0 | 0.9 | 1.3 | 0.6 | 2.2 | 2.0 | 4.1 | 1.8 | 3.9 | 0.4 | 7.6 | 0.7 | 6.5 |
| Diseases of the nails | |||||||||||||||||
| Incidence | 6.8 | 6.0 | 7.5 | 2.4 | 3.4 | 4.7 | 9.3 | 13.3 | 8.7 | 6.6 | 7.9 | 4.8 | 6.0 | 5.0 | 8.0 | 5.2 | 10.5 |
| Prevalence | 6.8 | 6.1 | 7.5 | 2.4 | 3.4 | 4.7 | 9.3 | 13.3 | 8.7 | 6.7 | 7.9 | 5.0 | 6.0 | 5.0 | 8.0 | 5.2 | 10.5 |
| Diseases of sebaceous glands and sweat glands | |||||||||||||||||
| Incidence | 1.8 | 1.5 | 2.1 | 1.2 | 0.4 | 0.4 | 2.6 | 2.5 | 4.3 | 2.1 | 2.5 | 1.2 | 1.6 | 1.7 | 0.7 | 1.4 | 0.9 |
| Prevalence | 1.9 | 1.6 | 2.1 | 1.2 | 0.4 | 0.4 | 2.6 | 3.2 | 4.3 | 2.2 | 2.5 | 1.3 | 1.6 | 1.7 | 0.7 | 1.4 | 0.9 |
| Melanoma | |||||||||||||||||
| Incidence | 0.2 | 0.2 | 0.3 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 0.3 | 0.2 | 0.6 | 0.4 | 0.7 | 0.7 | 0.4 |
| Prevalence | 1.7 | 1.0 | 2.4 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.5 | 2.2 | 1.7 | 4.8 | 2.1 | 2.5 | 6.0 | 5.2 |
| Pruritus | |||||||||||||||||
| Incidence | 2.1 | 1.7 | 2.4 | 0.0 | 0.0 | 1.1 | 0.9 | 0.3 | 0.9 | 0.6 | 2.0 | 2.4 | 3.1 | 3.8 | 2.2 | 9.7 | 10.0 |
| Prevalence | 2.2 | 19 | 2.5 | 0.0 | 0.0 | 1.1 | 0.9 | 0.3 | 1.2 | 0.6 | 2.2 | 3.0 | 3.1 | 4.6 | 2.2 | 9.7 | 10.0 |
| Psoriasis | |||||||||||||||||
| Incidence | 1.5 | 1.3 | 1.6 | 0.0 | 0.4 | 0.4 | 0.4 | 1.9 | 0.9 | 1.5 | 1.9 | 1.4 | 2.2 | 1.7 | 1.5 | 2.2 | 3.1 |
| Prevalence | 15.9 | 15.5 | 16.4 | 0.0 | 0.4 | 0.9 | 0.7 | 3.8 | 7.7 | 13.0 | 12.8 | 21.0 | 20.0 | 46.2 | 39.3 | 46.3 | 51.9 |
| Sebaceous cyst | |||||||||||||||||
| Incidence | 10.8 | 11.2 | 10.4 | 0.4 | 0.4 | 2.5 | 0.9 | 6.7 | 9.3 | 15.1 | 12.4 | 14.9 | 13.8 | 11.3 | 15.6 | 17.2 | 11.8 |
| Prevalence | 10.8 | 11.2 | 10.4 | 0.4 | 0.4 | 2.5 | 0.9 | 6.7 | 9.3 | 15.1 | 12.4 | 15.0 | 13.8 | 11.3 | 15.6 | 17.2 | 11.8 |
| Seborrheic dermatitis | |||||||||||||||||
| Incidence | 5.8 | 5.0 | 6.5 | 3.6 | 7.6 | 3.8 | 2.4 | 3.5 | 5.6 | 3.8 | 6.4 | 6.3 | 6.9 | 9.2 | 6.2 | 9.0 | 13.5 |
| Prevalence | 12.9 | 12.8 | 13.0 | 3.6 | 7.6 | 5.4 | 4.0 | 7.0 | 9.0 | 8.9 | 11.7 | 17.4 | 16.7 | 20.8 | 14.9 | 53.7 | 31.8 |
| Seborrheic keratosis (wart seborrheic) | |||||||||||||||||
| Incidence | 7.2 | 6.2 | 8.1 | 0.0 | 0.0 | 0.2 | 0.0 | 0.3 | 0.3 | 2.9 | 3.7 | 12.2 | 16.3 | 14.6 | 19.3 | 21.6 | 18.7 |
| Prevalence | 7.2 | 6.3 | 8.1 | 0.0 | 0.0 | 0.2 | 0.0 | 0.3 | 0.3 | 2.9 | 3.7 | 12.2 | 16.3 | 15.0 | 19.3 | 21.6 | 18.7 |
| Squamous cell carcinoma | |||||||||||||||||
| Incidence | 0.4 | 0.5 | 0.3 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.3 | 0.0 | 0.0 | 0.2 | 0.3 | 2.9 | 0.4 | 4.5 | 1.7 |
| Prevalence | 0.6 | 0.8 | 0.5 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 1.5 | 0.0 | 0.0 | 0.4 | 0.5 | 5.4 | 0.7 | 6.0 | 3.5 |
Note: Use of patient-years is necessary in long-term follow-up research because not every patient under study can be observed for the same period (because of death, for example). Total number of patient-years in the registry is the sum of the observation period for all observed individuals. In this case, each month within the 5-year period a patient could be observed counts for 1/12 patient year in the total number of patient years in the network.