Table 5.

Multivariable Models Evaluating the Associations between Physician and Vignette Patient Characteristics with the Decision to Recommend Chemotherapy (Model A) and the Decision to Recommend Single Agent vs Combination Therapy (Model B)

Variables	Adjusted Odds Ratio	95% Confidence Interval
Model A** Decision to Recommend Chemotherapy vs No Chemotherapy
Physician Characteristics
Age (years)	1.00	0.93–1.08
Gender
Female	1 (ref)
Male	0.85	0.43–1.66
Race
Non-white	1 (ref)
White	0.76	0.39–1.46
Number of years in practice	1.01	0.94–1.09
Number of patients seen per day	1.01	0.97–1.06
Number of days per week seeing patient	1.24	0.87–1.76
Vignette Patient Characteristics
Age (years)
72	5.01*	2.73–9.20
84	1 (ref)
Cognitive impairment
No	5.42*	3.01–9.76
Yes	1 (ref)
Functional impairment
No	3.85*	2.12–7.00
Yes	1 (ref)
Model B^ Decision to Recommend Single Agent vs Combination Therapy
Physician Characteristics
Age (years)	1.01	0.92–1.11
Gender
Female	1 (ref)
Male	1.00	0.39–2.60
Race
Non-white	1 (ref)
White	1.28	0.54–3.08
Number of years in practice	1.00	0.91–1.10
Number of patients seen per day	1.01	0.95–1.08
Number of days per week seeing patient	0.75	0.46–1.24
Vignette Patient Characteristics
Age (years)
72	1 (ref)
84	3.22*	1.43–7.25
Cognitive impairment
No	1 (ref)
Yes	3.13*	1.36–7.20
Functional impairment
No	1 (ref)
Yes	2.48*	1.12–5.46

^*p<0.05

^**Model A, n=279; 26 observations not included due to missing information for response and exploratory variables

^{^}Model B, n=161; model includes only those observations where chemotherapy was recommended