Comparison of psoriatic spondyloarthropathy subgroups. Continuous data are expressed as mean (standard deviation)
| Variables | Pure axial pattern (n=23) | Polyaxial pattern (n=36) | Oligoaxial pattern (n=41) | p Values |
|---|---|---|---|---|
| IBP, inflammatory back pain; SI, sacroiliitis; ESR, erythrocyte sedimentation rate; CRP, C reactive protein; DIP, distal interphalangeal joint; HAQ-S, Health Assessment Questionnaire-Specific for spondylarthropathy. | ||||
| *Erosive coxofemoral joint disease. | ||||
| Age (years) | 43 (11) | 54 (12) | 46 (15) | 0.039 |
| Psoriasis duration (years) | 16 (9) | 19 (8) | 17 (11) | NS |
| Arthritis duration (years) | 10 (6) | 13 (7) | 10 (5) | NS |
| Psoriasis onset age (years) | 27 (10) | 35 (13) | 29 (14) | NS |
| Arthritis onset age (years) | 33 (8) | 40 (12) | 37 (15) | NS |
| Psoriasis-arthritis latency (years) | 8 (4) | 8 (7) | 14 (10) | 0.07 |
| Family history (%) | 17 | 19 | 22 | NS |
| IBP (%) | 83 | 36 | 37 | 0.009 |
| Neck pain (%) | 22 | 25 | 27 | NS |
| Radiological neck involvement (%) | 35 | 56 | 39 | NS |
| Marginal syndesmophytes (%) | 26 | 19 | 19 | NS |
| Para-marginal syndesmophytes (%) | 13 | 28 | 24 | NS |
| Bilateral SI (%) | 56 | 31 | 37 | NS |
| Unilateral SI (%) | 44 | 44 | 48 | NS |
| Onychopathy (%) | 30 | 75 | 51 | 0.015 |
| ESR (mm/1st h) | 27 (20) | 47 (26) | 20 (21) | 0.0001 |
| CRP (mg/l) | 160 (250) | 190 (160) | 100 (130) | NS |
| C3 (g/l) | 1.3 (0.3) | 1.2 (0.3) | 1.2 (0.3) | 0.037 |
| C4 (g/l) | 0.3 (0.1) | 0.2 (0.1) | 0.3 (0.1) | 0.045 |
| IgG (g/l) | 13.70 (2.60) | 16.05 (5.00) | 12.17 (2.80) | 0.029 |
| IgM (g/l) | 1.93 (1.02) | 1.71 (0.73) | 1.55 (0.89) | NS |
| IgA (g/l) | 3.12 (1.42) | 2.85 (1.29) | 2.86 (1.86) | NS |
| Erosive disease (%) | 4* | 75 | 37 | 0.0001 |
| DIP disease (%) | 17 | 64 | 51 | 0.015 |
| HLA-B27 (%) | 57 | 19 | 29 | 0.016 |
| Uveitis (%) | 30 | 11 | 10 | 0.022 |
| Schober’s test (cm) | 2.5 (0.3) | 2.7 (0.5) | 2.8 (0.4) | NS |
| HAQ-S (mean) | 1.4 (0.4) | 1.8 (0.4) | 1.5 (0.3) | 0.03 |