Table 3.

Demographic and disease characteristics in patients with diffuse idiopathic skeletal hyperostosis (DISH) by presence of sacroiliitis (n = 76*).

Sacroiliitis, Mean (SD) or Frequency (%)
CharacteristicYes, n = 37No, n = 39p**
Age, yrs62.5 (8.3)63.0 (9.0)0.81
Age at diagnosis of psoriasis, yrs37.8 (16.9)39.9 (14.1)0.56
Age at diagnosis of PsA, yrs48.2 (11.7)47.3 (14.6)0.78
Duration of psoriasis, yrs24.7 (16.6)23.4 (13.0)0.70
Duration of PsA, yrs14.3 (11.2)15.9 (12.3)0.55
Sex, males/females (%)30 (81.1)25 (64.1)0.10
Body mass index33.3 (5.8)32.1 (5.1)0.47
Obesity (%)16 (76.2)14 (63.6)0.37
Enthesitis (%)2 (5.4)5 (12.8)0.43
Damaged joint count15.9 (19.7)8.2 (11.8)0.04
Diabetes (%)13 (38.2)8 (20.5)0.10
Hypertension (%)15 (40.5)22 (56.4)0.17
Angina (%)2 (5.6)1 (2.6)0.51
Myocardial infarction (since last visit; %)0 (0)2 (6.1)0.49
Inflammatory back pain (%)6 (24.0)4 (14.8)0.49
Erythrocyte sedimentation rate25.1 (17.9)17.1 (15.5)0.05
C-reactive protein13.5 (16.6)9.7 (9.3)0.44
Elevated uric acid levels (%)5 (14.3)7 (18.4)0.76
Radiographic damage (%)32 (86.5)32 (82.1)0.60
Steinbrocker score44.1 (48.2)20.7 (26.5)0.01
Calcaneal spurs (%)28 (75.7)35 (89.7)0.10
HLA-B*27 (%)4 (13.3)4 (10.8)NS
HLA-C*06 (%)5 (16.7)8 (21.6)0.61
  • * Information on sacroiliitis was not available for 2 patients.

  • ** Using t test for continuous variables and Fisher’s exact test and chi-square test for categorical variables. PsA: psoriatic arthritis; NS: nonsignificant.