. Author manuscript; available in PMC: 2019 Jul 1.

Published in final edited form as: Breast J. 2018 Mar 2;24(4):526–530. doi: 10.1111/tbj.13002

Table 2.

Univariable Poisson Count Regression for Total Removed Sentinel Lymph Nodes

Variable	IRR	95% Confidence Interval		p-value
		LL	UL
Age (years)	0.995	0.991	0.999	0.021^*
BMI (kg/m²)	0.997	0.988	1.006	0.533
Neoadjuvant Therapy
none	Ref
Chemotherapy	1.232	1.060	1.426	<0.01^*
Hormone	1.300	0.940	1.747	0.180
Day Protocol
“One-day”	Ref
“Two-day”	0.861	0.707	1.038	.125
Radiologist
#1	Ref
#2	1.002	0.894	1.124	0.970
#3	1.237	0.918	1.630	0.145
Surgery
Lumpectomy	Ref
Mastectomy	0.814	0.717	0.922	<0.01^*
SLN biopsy only	0.788	0.489	1.192	0.292
Surgeon
#1	Ref
#2	1.293	1.155	1.449	<0.01^*
Frozen Section
No	Ref
Yes	0.888	0.789	0.997	0.046^*

Legend: IRR: Incident Rate Ratio, LL: lower limit, UL: upper limit, SLN: sentinel lymph node

statistically significant