Table 4 Differences in clinical and patient reported characteristics (not used in clustering) across clusters (fibromyalgia positive participants)
| Â | Cluster 1 | Cluster 2 | Cluster 3 | Â |
N (%) | N (%) | N (%) | p value | |
Gender | ||||
 male | 4 (23.5) | 94 (59.9)a | 63 (52.5) | p = 0.014 |
 female | 13 (76.5) | 63 (40.1) | 57 (47.5) | |
Smoking Status | ||||
 never | 5 (29.4) | 53 (34.2) | 51 (43.6) | p = 0.027 |
 ex | 6 (35.3) | 52 (33.5) | 48 (41.0) | |
 current | 6 (35.3) | 50 (32.3) | 18 (15.4) | |
Alcohol Use | ||||
 never | 1 (5.9) | 21 (13.5) | 13 (11.1) | p = 0.032 |
 ex | 7 (41.2) | 50 (32.3) | 21 (18.0) | |
 current | 9 (52.9) | 84 (54.2) | 83 (70.9) | |
Employed | ||||
 no | 8 (47.1) | 85 (54.1) | 47 (39.5) | p = 0.054 |
 yes | 9 (52.9) | 72 (45.9) | 72 (60.5) | |
Job type | ||||
 mainly sedentary | 1 (12.5) | 30 (43.5) | 39 (55.7) | p = 0.044 |
 mainly physical | 7 (87.5) | 39 (56.5) | 31 (44.3) | |
Current biologic therapy | ||||
 no | 13 (76.5) | 87 (55.4) | 74 (61.7) | p = 0.189 |
 yes | 4 (23.5) | 70 (44.6) | 46 (38.3) | |
NSAID (last 6 m) | ||||
 no | 3 (17.6) | 55 (35.0) | 32 (26.7) | p = 0.160 |
 yes | 14 (82.4) | 102 (65.0) | 88 (73.3) | |
DMARD use in past 6 m | ||||
 no | 10 (58.8) | 136 (86.6)a | 102 (85.0) | p = 0.011 |
 yes | 7 (41.2) | 21 (13.4) | 18 (15.0) | |
| Â | Mean 95% CI | Mean (95% CI) | Mean (95% CI) | Â |
Age | ||||
 years | 49.2 (43.3, 55.0) | 47.8 (45.7, 50.0) | 50.4 (47.8, 53.0) | p = 0.445 |
Age at symptom onset | ||||
 years | 29.3 (25.6, 33.0) | 29.7 (27.7, 31.7) | 29.7 (27.5, 31.9) | p = 0.873 |
Disease Activity | ||||
 BASDAI: 0 (best) – 10 (worst) | 7.8 (7.2, 8.5) | 7.4 (7.2, 7.6) | 6.0 (5.7, 6.2) | p < 0.001 |
Disease Activity | ||||
 ASDAS | 3.8 (3.4, 4.2) | 3.9 (3.8, 4.1) | 3.3 (3.2, 3.5) | p < 0.001 |
Physical Function | ||||
 BASFI: 0 (best) – 10 (worst) | 7.2 (6.3, 8.1) | 7.2 (6.9, 7.5) | 5.5 (5.1, 5.9) | p < 0.001 |
Spinal Mobility | ||||
 BASMI: 0 (best) – 10 (worst) | 4.3 (3.4, 5.1) | 4.2 (3.8, 4.6) | 4.1 (3.6, 4.6) | p = 0.934 |
Patient Global | ||||
 BASG: 0 (best) – 10 (worst) | 7.7 (7.1, 8.3) | 7.7 (7.4, 7.9) | 6.1 (5.7, 6.5) | p < 0.001 |
Spinal Pain | ||||
 0 (best) – 10 (worst) | 6.2 (4.7, 7.6) | 7.1 (6.8, 7.4) | 5.6 (5.1, 6.0) | p < 0.001 |
SF12 Mental Component | ||||
 100 (best) – 0 (worst) | 31.4 (26.6, 36.3) | 32.5 (31.1, 34.0) | 44.2 (42.5, 45.9) | p < 0.001 |
SF12 Physical Component | ||||
 100 (best) – 0 (worst) | 28.9 (25.0, 32.8) | 29.9 (28.4, 31.5) | 34.3 (32.4, 36.2) | p < 0.001 |
Quality of Life | ||||
 ASQoL: 0 (best) – 18 (worst) | 15.4 (14.2, 16.7) | 14.6 (14.1, 15.1) | 10.9 (10.2, 11.5) | p < 0.001 |
Work absence | ||||
 absenteeism: % | 7.0 (1.3, 12.7) | 14.2 (8.2, 20.1) | 9.3 (4.4, 14.1) | p = 0.737 |
Work impairment | ||||
 presenteeism: % | 55.6 (42.4, 68.7) | 60.3 (55.1, 65.6) | 44.8 (39.8, 49.8) | p < 0.001 |
Overall work impairment | ||||
 % | 56.4 (41.3, 71.6) | 63.4 (58.0, 68.9) | 48.0 (42.7, 53.3) | p < 0.001 |
Other activity impairment | ||||
 % | 75.9 (66.4, 85.4) | 72.0 (69.4, 74.7) | 54.5 (50.2, 58.8) | p < 0.001 |