Table 2

Longitudinal relationship (standard model) between disease activity measures and inflammation degree (SPARCC) on MRI-SI stratified for gender in six separate models

	Males			Females
	β	95% CI	QIC	β	95% CI	QIC
ASDAS	*2.408*	*1.127 to 3.690*	18 228	0.301	−0.530 to 1.133	3700
BASDAI (0–10)	0.309	−0.330 to 0.947	20 558	−0.165	−0.473 to 0.143	3588
Night pain (0–10)	0.497	*0.040 to 0.954*	20 525	0.014	−0.146 to 0.175	3689
Patient's global disease (0–10)	0.451	*0.062 to 0.841*	20 060	−0.028	−0.189 to 0.132	3676
ESR (mm/h)	0.181	*0.009 to 0.354*	13 571	0.066	−0.007 to 0.139	2279
CRP (mg/L)	0.149	*0.028 to 0.270*	18 128	0.047	−0.059 to 0.154	3685

Bold italics mean “statistically significant: p value <0.05)”.
Six separate models were built for both genders, each one of them including one of the disease activity parameters. All models were adjusted for age, symptom duration and HLA-B27.
ASDAS, Ankylosing Spondylitis Disease Activity Index; BASDAI, Bath Ankylosing Spondylitis Disease Activity Index; CRP, C reactive protein; ESR, erythrocyte sedimentation rate; HLA-B27, human leucocyte antigen B27; patient's global disease, patient’s global assessment for disease activity; QIC, quasi-likelihood under independence model criterion; SPARCC, Spondyloarthritis Research Consortium of Canada.