Table 2

Univariate and multivariate linear regression analyses using ASDAS-CRP as dependent variables

Univariate analyses using ASDAS-CRP as dependent variableMultivariate 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 coefficientRegression coefficient (95% CI)P valueStandard coefficientRegression coefficient (95% CI)P valueStandard coefficientRegression 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)0.190.18 (−0.03 to 0.39)0.100.140.14 (−0.07 to 0.34)0.190.150.14 (−0.06 to 0.35)0.17
ADCmax (N=78)0.290.001 (0.00 to 0.001)0.010.270.001 (0.00 to 0.001)0.02
ADCmean (N=78)0.280.001 (0.00 to 0.002)0.010.210.001 (0.00 to 0.002)0.07
SPARCC spine MRI score (N=74)0.310.03 (0.01 to 0.04)0.010.320.03 (0.01 to 0.05)0.010.340.03 (0.01 to 0.05)<0.01
Age (N=78)0.050.003 (−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)0.170.30 (−0.01 to 0.68)0.13
Drinker (N=78)0.120.31 (−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)0.150.30 (−0.16 to 0.77)0.20
Tender joint count (N=75)0.160.09 (−0.04 to 0.21)0.18
Ever enthesitis (N=78)0.100.17 (−0.20 to 0.55)0.37
nADCmax (N=78)0.010.10 (−0.09 to 0.10)0.91
nADCmean (N=78)0.040.04 (−0.16 to 0.23)0.73
SPARCC SI MRI score (N=67)0.130.02 (−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.