Table 1.
Demographic characteristics of patients with nr-axSpA, AS and other IBP in Northwest Africa (Morocco, Algeria) and South Africa
| Northwest Africa | South Africa | |||||||
|---|---|---|---|---|---|---|---|---|
| Total (N = 168) | nr-axSpA (n = 26) | AS (n = 110) | Other IBP (n = 32) | Total (N = 38) | nr-axSpA (n = 7) | AS (n = 14) | Other IBP (n = 17) | |
| Male, n (%) | 99 (58.9) | 15 (57.7) | 72 (65.4) | 12 (37.5) | 17 (44.7) | 3 (42.9) | 8 (57.1) | 6 (35.3) |
| Age, mean (SD) | 40.2 (11.9) | 34.2 (9.7) | 38.3 (10.1) | 51.3 (12.9) | 44.0 (12.6) | 45.9 (10.0) | 43.8 (14.1) | 43.4 (12.9) |
| Race/ethnicity | ||||||||
| Arab, n (%) | 129 (76.8) | 21 (80.8) | 79 (71.8) | 29 (90.6) | ||||
| Berber, n (%) | 34 (20.2) | 5 (19.2) | 26 (23.6) | 3 (9.4) | ||||
| Indian, n (%) | 2 (5.3) | 1 (14.3) | 0 (0.0) | 1 (5.9) | ||||
| White/Caucasian, n (%) | 27 (71.1) | 5 (71.4) | 12 (85.7) | 10 (58.8) | ||||
| Black African, n (%) | 1 (2.6) | 0 (0.0) | 1 (7.1) | 0 (0.0) | ||||
| Othera, n (%) | 7 (18.4) | 1 (14.3) | 1 (7.1) | 5 (29.4) | ||||
| Missing, n | 5 | 0 | 5 | 0 | 1 | 0 | 0 | 1 |
| BMI, mean (SD) | 24.7 (4.5) | 24.3 (3.9) | 24.6 (4.3) | 25.6 (5.3) | 26.9 (4.3) | 26.3 (3.9) | 25.4 (3.4) | 28.4 (4.8) |
| BMI category, obese, n (%) | 16 (9.5) | 2 (7.7) | 10 (9.1) | 4 (12.5) | 8 (21.1) | 0 (0.0) | 1 (7.1) | 7 (41.2) |
| Time since CLBP presentation, mean (SD), years | 8.6 (7.3) | 6.9 (9.3) | 9.5 (7.0) | 6.9 (6.2) | 15.3 (13.3) | 15.0 (12.9) | 14.0 (14.8) | 16.4 (13.1) |
| n | 166 | 25 | 109 | 32 | 28 | 4 | 11 | 13 |
| Age of IBP onset, mean (SD), years | 31.2 (11.3) | 28.0 (8.6) | 28.3 (8.1) | 44.2 (14.1) | 28.2 (11.2) | 29.9 (9.4) | 27.8 (9.6) | 27.9 (13.4) |
| n | 166 | 26 | 109 | 31 | 38 | 7 | 14 | 17 |
| Diagnosis of IBP as reported in CRF, n (%) | ||||||||
| nr-axSpA | 18 (10.7) | 7 (26.9) | 3 (2.7) | 8 (25.0) | 6 (15.8) | 2 (28.6) | 3 (21.4) | 1 (5.9) |
| AS | 127 (75.6) | 18 (69.2) | 93 (84.6) | 16 (50.0) | 19 (50.0) | 5 (71.4) | 11 (78.6) | 3 (17.7) |
| Other IBP | 23 (13.7) | 1 (3.9) | 14 (12.7) | 8 (25.0) | 13 (34.2) | 0 (0.0) | 0 (0.0) | 13 (76.5) |
AS ankylosing spondylitis, BMI body mass index, CLBP chronic low back pain, CRF case report form, IBP inflammatory back pain, nr-axSpA non-radiographic axial spondyloarthritis, n/N number, SD standard deviation
aIncluding black, mulatto, mulato, and zambo, based on physician-reported patient race or ethnicity