Table 2.

Multivariate logistic regression assessing for association of various laboratory values and sacroiliitis, defined according to the mNY criteria

Laboratory variables	Number of observations	Odds ratio (95% CI)	p-value	AIC	BIC
NLR	1451	1.459 (1.028–2.069)	0.034	955.419	1002.940
PLR	990	4.842 (2.029–11.549)	<0.001	526.977	571.057
ESR	669	4.397 (2.128–9.085)	<0.001	365.383	405.935
CRP	904	2.911 (1.518–5.584)	0.001	566.035	609.296
PLR (+ ESR)	560	8.200 (1.352–49.731)	0.022	272.468	315.748
PLR (+ CRP)	549	18.361 (3.230–104.379)	0.001	286.151	329.323

All models controlled for gender, age, duration of disease, tobacco use, education, marital status, working status. The final models (+ ESR and + CRP) tested for associations of PLR and sacroiliitis after inclusion either ESR or CRP in the model.

NLR was not significant (P>0.05) for any model that included ESR and CRP (data not shown).

mNY, modified New York; NLR, neutrophil-lymphocyte ratio; PLR, platelet-lymphocyte ratio; ESR, erythrocyte sedimentation rate; CRP, C-reactive protein; CI, confidence interval; AIC, Akaike Information Criteria; BIC, Bayesian Information Criteria; mm/Hr, millimeters per hour; mg/dL, milligrams per deciliter