Table 1 Frequency and proportion with current inflammatory back pain among AS, PsA and other-SpA. Legend: For each group only data for responders to the postal survey (N = 2785) are included, stratified first on sex and then on age-groups. Registered data for 6 responders were incomplete and are thus excluded from the study
Ankylosing Spondylitis (AS) N = 744 | Psoriatic arthritis (PsA) N = 1310 | p-value AS vs PsA | Other Spondyloarthritis (SpA) N = 725 | p-value AS vs SpA | p-value PsA vs SpA | ||||
|---|---|---|---|---|---|---|---|---|---|
Men (%) | 451 (61) | 552 (42) | <0.001 | 286 (39) | <0.001 | 0.240 | |||
Current IBPa (%) | 319 (43) | 409 (31)b | <0.001 | 282 (39)c | 0.112 | 0.001 | |||
Sex | Women N = 293 | Men N = 451 | Women N = 758 | Men N = 552 | Women N = 439 | Men N = 286 | |||
Current IBP N(%) | 137 (47) | 182 (40) | 280 (37) | 129 (23) | 195 (44) | 87 (30) | |||
p-value men vs women | 0.111 | <0.001 | <0.001 | ||||||
Age groups | Total | Current IBP (%) | Total | Current IBP (%) | Total | Current IBP (%) | |||
15–29 | 42 | 12 (29) | 50 | 9 (18) | 0.319 | 72 | 29 (40) | 0.231 | 0.010 |
30–44 | 190 | 82 (43) | 241 | 73 (30) | 0.006 | 185 | 74 (40) | 0.600 | 0.040 |
45–59 | 243 | 126 (52) | 463 | 172 (37) | <0.001 | 222 | 96 (43) | 0.077 | 0.133 |
60–74 | 226 | 86 (38) | 464 | 133 (29) | 0.015 | 198 | 64 (32) | 0.224 | 0.354 |
>75 | 43 | 13 (30) | 92 | 22 (24) | 0.303 | 48 | 19 (40) | 0.519 | 0.077 |