Table 2.

Univariate and multivariate Logistic regression for risk factors of metastasis in Ewing tumor patients

	Univariate		Multivariate
Variables	OR (95% CI)	p value	OR (95% CI)	p value
Age (years)
≤ 10	Reference	0.012*	Reference	0.144
11–20	1.840 (1.271–2.665)	0.001**	1.517 (1.033–2.228)	0.034*
21–30	1.973 (1.273–3.058)	0.002**	1.659 (1.054–2.610)	0.029*
31–49	1.440 (0.826–2.511)	0.199	1.388 (0.780–2.470)	0.264
≥ 50	2.108 (1.009–4.403)	0.047*	2.082 (0.977–4.438)	0.058
Gender
Male	Reference
Female	1.013 (0.775–1.324)	0.926
Race
White	Reference	0.751
Black	1.346 (0.622–2.910)	0.451
Other	0.994 (0.610–1.618)	0.980
Primary site
Limb	Reference	< 0.001***	Reference	< 0.001***
Cranial	0.355 (0.150–0.843)	0.019*	0.486 (0.201–1.176)	0.110
Spine	0.851 (0.482–1.502)	0.577	1.033 (0.572–1.865)	0.914
Thoracic	1.212 (0.812–1.808)	0.347	1.245 (0.830–1.867)	0.289
Pelvic	2.679 (1.975–3.635)	< 0.001***	2.492 (1.829–3.395)	< 0.001***
Tumor size (cm)
< 5	Reference	< 0.001***	Reference	0.005**
5–8	1.598 (1.040–2.456)	0.033*	1.362 (0.871–2.131)	0.176
> 8	2.624 (1.764–3.903)	< 0.001***	1.914 (1.251–2.928)	0.003**

OR odds ratio

p value < 0.05*, < 0.01**, < 0.001***