Diagnostic Performance of Red Cell Distribution Width in Adult Iraqi Patients with Ankylosing Spondylitis

Table 2

Multiple linear regression analysis to show the effects of demographic and clinical characteristic on RDW.

Variables	Univariate		Multivariate
	r	P value	r	P value
Age	-0.216	0.016 [Sig.]	-0.307	0.002
BMI	-0.051	0.309
Disease Duration	-0.165	0.051
BASDI	0.326	<0.001 [Sig.]
BASFI	0.010	0.460
ESR	0.413	<0.001 [Sig.]
CRP	0.360	<0.001 [Sig.]	0.251	0.013
HB	-0.486	<0.001 [Sig.]	-0.421	<0.001
WBC	-0.013	0.449
Neutrophil	0.002	0.493
Lymph	-0.071	0.243
N/L ratio	-0.013	0.448
PLT	0.227	0.012 [Sig.]
PLT/L ratio	0.023	0.411
Monocyte	0.070	0.246
DMARDs	0.133	0.186
Biologics	-0.053	0.604
Steroids	0.130	0.198
NSAIDs	0.205	041 [Sig.]

BMI: body mass index, BASDAI: Bath Ankylosing Spondylitis Disease Activity Index, BASFI: Bath Ankylosing Spondylitis Functional Index, ESR: erythrocytes sedimentation rates, CRP: C-reactive protein, HB: hemoglobin, WBC: white blood cells, N/L ratio: neutrophil/lymphocytes ratio, PLT: platelets, PLT/L: platelets/lymphocytes, DMARDs: disease modifying antirheumatic drugs, and NSAIDs: nonsteroidal anti-inflammatory drugs.