Table 3. Multivariate analysis of rib metastasis in 151 patients with concurrent lesions on bone scans.

Variables		Rib metastasis (n = 57)	No rib metastasis (n = 94)	Total (n = 151)	P-value1	OR1	95% CI1
Tumor size	≤2 cm	8	41	49		Reference
	2–5 cm	21	34	55	0.140	2.46	0.74–8.16
	>5 cm	4	2	6	0.060	12.32	0.90–168.90
	NA	24	17	41
Lymph node	Negative	12	39	51		Reference
	Positive	33	47	80	0.996	1.00	0.30–3.38
	NA	12	8	20
Number of rib lesions	1–2	14	76	90		Reference
	≥3	43	18	61	0.054	2.62	0.99–6.95
Localization	Anterior	10	48	58		Reference
	Lateral	0	11	11	/	/	/
	Posterior	7	17	24	0.654	1.50	0.25–8.81
	Multiple	37	13	50	0.167	4.55	0.53–38.96
	NA	3	5	8
Relationship with the operative site	Ipsilateral	9	51	60		Reference
	Contralateral	10	26	36	0.061	5.36	0.92–31.15
	Bilateral	37	15	52	0.401	2.51	0.29–21.56
	NA	1	2	3

NA, not available; OR, odds ratio; CI, confidence interval; 1, calculated by multivariate analysis.