Table 2.
Univariate and multivariate linear regression analyses using ASDAS-CRP as dependent variables
| Univariate analyses using ASDAS-CRP as dependent variable | Multivariate analyses using ASDAS-CRP as dependent variable and ADCmax as independent variable (N=70) | Multivariate analyses using ASDAS-CRP as dependent variable and ADCmean as independent variable (N=70) | |||||||
| Standard coefficient | Regression coefficient (95% CI) | P value | Standard coefficient | Regression coefficient (95% CI) | P value | Standard coefficient | Regression coefficient (95% CI) | P value | |
| HLA-B27 positivity (N=77) | −0.19 | −0.44 (−0.95 to −0.07) | 0.09 | −0.21 | −0.51 (−1.03 to 0.02) | 0.06 | −0.21 | −0.49 (−1.02 to 0.05) | 0.08 |
| Swollen joint count (N=75) | 0.19 | 0.18 (−0.03 to 0.39) | 0.10 | 0.14 | 0.14 (−0.07 to 0.34) | 0.19 | 0.15 | 0.14 (−0.06 to 0.35) | 0.17 |
| ADCmax (N=78) | 0.29 | 0.001 (0.00 to 0.001) | 0.01 | 0.27 | 0.001 (0.00 to 0.001) | 0.02 | – | – | – |
| ADCmean (N=78) | 0.28 | 0.001 (0.00 to 0.002) | 0.01 | – | – | – | 0.21 | 0.001 (0.00 to 0.002) | 0.07 |
| SPARCC spine MRI score (N=74) | 0.31 | 0.03 (0.01 to 0.04) | 0.01 | 0.32 | 0.03 (0.01 to 0.05) | 0.01 | 0.34 | 0.03 (0.01 to 0.05) | <0.01 |
| Age (N=78) | 0.05 | 0.003 (−0.01 to 0.02) | 0.67 | – | – | – | – | – | – |
| Male gender (N=78) | −0.09 | −0.15 (−0.55 to 0.25) | 0.45 | – | – | – | – | – | – |
| Smoker (N=78) | 0.17 | 0.30 (−0.01 to 0.68) | 0.13 | – | – | – | – | – | – |
| Drinker (N=78) | 0.12 | 0.31 (−0.27 to 0.89) | 0.30 | – | – | – | – | – | – |
| Duration of back pain (N=77) | −0.01 | −0.001 (−0.02 to 0.02) | 0.94 | – | – | – | – | – | – |
| Family history of SpA (N=75) | 0.15 | 0.30 (−0.16 to 0.77) | 0.20 | – | – | – | – | – | – |
| Tender joint count (N=75) | 0.16 | 0.09 (−0.04 to 0.21) | 0.18 | – | – | – | – | – | – |
| Ever enthesitis (N=78) | 0.10 | 0.17 (−0.20 to 0.55) | 0.37 | – | – | – | – | – | – |
| nADCmax (N=78) | 0.01 | 0.10 (−0.09 to 0.10) | 0.91 | – | – | – | – | – | – |
| nADCmean (N=78) | 0.04 | 0.04 (−0.16 to 0.23) | 0.73 | – | – | – | – | – | – |
| SPARCC SI MRI score (N=67) | 0.13 | 0.02 (−0.02 to 0.06) | 0.30 | – | – | – | – | – | – |
ADC, apparent diffusion coefficient; ADCmax, maximum apparent diffusion coefficient; ASAS, Assessment of Spondyloarthritis International Society; CRP, C reactive protein; HLA, human leucocyte antigen; N, number; NaDCmax, normalised maximum apparent diffusion coefficient; SI, sacroiliac; SPARCC, Spondyloarthritis Research Consortium of Canada; SpA, spondyloarthritis.