Table 4.

Uni- and multivariate analyses of factors associated with correct preoperative sonographic prediction of limited histopathologic axillary disease (one or two metastatic lymph nodes): for the whole cohort and patients ≥ 70 years; NST, no special type

	Univariate analysis		Multivariate analysis
	Odds ratio (95% CI)	p	Odds ratio (95% CI)	p
Whole cohort
Body mass index	1.00 (0.99–1.01)	0.69
Age	0.99 (0.97–1.00)	0.06
Histology		0.69
NST versus invasive lobular	0.26 (0.01–25.96)	0.59
NST versus others	0.19 (0.01–19.29)	0.48
Subtype		0.11
Luminal A versus luminal B	0.72 (0.48–1.08)	0.11
Luminal A versus HER2/neu	0.32 (0.11–0.94)	0.04	2.36 (0.26–21.12)	0.44
Luminal A versus triple negative	0.68 (0.33–1.39)	0.29
T stage
T1 versus T2	0.49 (0.34–0.73)	≤ 0.01	1.61 (0.56–4.67)	0.61
Grade		0.01		0.98
G1 versus G2	0.39 (0.13–1.26)	0.12	1.37 (0.03–62.28)	0.87
G1 versus G3	0.23 (0.07–0.74)	≤ 0.01	1.87 (0.54–6.43)	0.32
Number of affected lymph nodes	0.08 (0.05–0.13)	≤ 0.01	0.01 (0.01–0.93)	≤ 0.01
Lymphovascular invasion (yes/no)	0.36 (0.24–0.54)	≤ 0.01	0.53 (0.19–1.48)	0.23
Age ≥ 70 years
Body mass index	1.01 (0.99–1.04)	0.37
Age	1.01 (0.95–1.06)	0.80
Histology		0.08
NST versus invasive lobular	0.29 (0.01–25.96)	0.59
NST versus others	0.19 (00.01–19.29)	0.48
Subtype		0.11
Luminal A versus luminal B	0.72 (0.39–1.33)	0.29
Luminal A versus HER2/neu	0.20 (0.02–1.79)	0.15
Luminal A versus triple negative	0.89 (0.31–2.56)	0.83
T stage
T1 versus T2	0.52 (0.29–0.94)	0.03	1.61 (0.56–4.67)	0.38
Grade		0.01		0.61
G1 versus G2	0.60 (0.09–3.72)	0.59	1.37 (0.03–62.28)	0.87
G1 versus G3	0.37 (0.06–2.43)	0.30	1.87 (0.54–6.44)	0.32
Number of affected lymph nodes	0.07 (0.03–0.15)	≤ 0.01	0.01 (0.01–0.03)	≤ 0.01
Lymphovascular invasion (yes/no)	0.39 (0.22–0.71)	≤ 0.01	0.53 (0.19–1.48)	0.23