. 2018 Jan 8;18:51. doi: 10.1186/s12885-017-3857-5

Table 2.

Multivariable regression analysis of factors associated with treatment category

Factor^a	Odds ratio^b [P-value]
Factor^a	Multivariable model 1^c	Multivariable model 2^d
Age: <65 vs ≥65 years	1.51 [P = 0.0056]	1.57 [P = 0.0020]
ECOG performance: 0 vs 1–4	1.80 [P = 0.00003]	1.84 [P = 0.00001]
Grading: Grade 1/2 vs grade 3	0.77 [P = 0.062]	0.77 [P = 0.058]
Radiotherapy: no vs yes	0.53 [P = 0.00002]	–

ECOG, Eastern Cooperative Oncology Group

^aFirst group mentioned is reference; − = not in model. ^bA value >1.0 indicates a higher probability of receiving Herceptin treatment without chemotherapy, as compared to reference group. ^cIncluding radiotherapy in the analysis. ^dExcluding radiotherapy from the analysis