No statistical differences were found between two groups of Sjögren patients, classified according to the EC criteria, one group with severe and another with mild ocular signs and symptoms, with regard to severity of the generalised autoimmune disease as expressed by mean concentrations of serum IgG (g/l)
| Ocular disease | Number | Mean concentration of serum IgG (g/l) | SD |
|---|---|---|---|
| Normality of distribution of serum IgG levels was confirmed in both patient groups, subsequently equal variance t test analysis was performed. | |||
| Mild | 14 | 17.0 | 6.7 |
| Severe | 11 | 18.9 | 7.8 |