Demographic details of study group
| Ankylosing spondylitis | Enteropathic spondylitis | Psoriatic spondylitis | Reactive arthritis | χ2(df=3)2-150 | Significant† | |
|---|---|---|---|---|---|---|
| Number | 91 | 31 | 34 | 7 | ||
| Male/female | 67/24 | 15/16 | 26/8 | 7/0 | 11.24 | NS |
| Age (y) median (range) | 46 (18–71) | 48 (34–75) | 46 (25–83) | 43 (25–47) | 6.58 | NS |
| Duration disease (y) median (range) | 18 (1–44) | 15 (6–39) | 16 (0–56) | 8 (5–12) | 7.15 | NS |
| Number (%) heel involvement | 12/82 (15) | 3/17 (18) | 4/21 (20) | 1/4 (25) | ‡ | |
| Number (%) uveitis | 19/83 (23) | 14/21 (67) | 4/23 (18) | 1/5 (20) | 17.75 | 0.004 |
| Schober’s (cm) median (range) | 2 (0–7) | 4 (0–7) | 4.85 (1–8) | 5.5 (4–7.5) | 15.3 | 0.016 |
| Chest expansion (cm) median (range) | 3 (0–6.5) | 4 (0–6) | 4 (0–6) | 3 (0–6) | 1.36 | NS |
| Number (%) B27 positive | 31/37 (84) | 8/10 (80) | 4/6 (67) | 2/2 (100) | ‡ |
↵2-150 χ2 on 2×4 tables. Kruskal-Wallis analysis of variance, χ2 statistic for interval scale data. †p Values multiplied by 8 to allow for multiple comparisons. ‡Comparison not made because minimum expected frequency in two cells was <2.