. 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 3.

Multivariable Poisson Count Regression for Total Removed Sentinel Lymph Nodes

Variable	IRR	95% Confidence Interval		p-value
		LL	UL
Age (years)	0.993	0.988	0.998	<0.01^*
BMI (kg/m²)	0.999	0.989	1.008	0.77
Neoadjuvant Therapy
None	Ref
Chemotherapy	1.193	0.995	1.422	0.053
Hormone	1.350	0.972	1.829	0.061
Day Protocol
“One-day”	Ref
“Two-day”	0.989	0.806	1.202	0.914
Radiologist
#1	Ref
#2	1.013	0.902	1.137	0.828
#3	1.175	0.864	1.565	0.285
Surgery
Lumpectomy	Ref
Mastectomy	0.884	0.703	1.112	0.290
SLN biopsy only	0.813	0.503	1.237	0.366
Surgeon
#1	Ref
#2	1.250	1.106	1.410	<0.01^*
Frozen Section
No	Ref
Yes	0.857	0.684	1.073	0.180

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

statistically significant