TABLE 3.
Results, Northern and Central European Studies after 1958, distribution of psoriasis relative to season in percentage
| Author, year, country | Sample size | Measure | Winter | Spring | Summer | Autumn | Method ranking b |
|---|---|---|---|---|---|---|---|
|
Lomholt 12 1964, Faroe Islands |
206 a | Improvement | 21 | 1 | 63 | 15 | Vc |
| Deterioration | 25 | 52 | 15 | 8 | |||
|
Hellgren 9 1964, Sweden |
255 a | Improvement | 28.7 | NA | 22.6 | NA | Vc |
|
Könönen 28 1986, Finland |
1516 | Deterioration | 54 | 18 | 2 | NA | Vd |
|
Knopf 5 1989, Germany |
390 | Improvement | NA | NA | 60.5 | NA | Vd |
| Deterioration | 37.4 | 42.3 | NA | NA |
a
Only 50% of the interviewed patient experienced seasonal variation.
b
Cochrane ranking of studies described in methods and materials, expressed in roman numbers. V: case series >10 patients, c: cases with a personal interview by the investigator (qualitative), d: cases based on questionnaires (qualitative).