Numbers of people with various degrees of severity of skin dryness among the primary Sjögren's syndrome patients (n=22)
| Degree of skin dryness | 0 | I | II | III | IV |
| Number of patients | 5 | 4 | 6 | 7 | 0 |
For a precise description of the assessment of the severity of skin dryness, see the text (Methods section).