Appendix Table 5.

Multivariable regression analyses^* showing the association between care density and outcomes; models do not and do include the number of doctors visits as a covariate. Care density is constructed using all primary care, oncology specialists, and other providers during Days 366 to 1095.

	Base Model	Including total number of doctors as covariate
	OR (95% CI)	OR (95% CI)
Hospitalization
<2 providers	1.11 (0.89 – 1.38)	1.02 (0.81 – 1.29)
Low care density	1.00	1.00
Middle care density	0.85 (0.74 – 0.98)	0.88 (0.76 – 1.02)
High care density	0.87 (0.75 – 1.00)	0.87 (0.76 – 1.01)
ED visit
<2 providers	1.37 (1.12 – 1.67)	1.24 (1.00 – 1.53)
Low care density	1.00	1.00
Middle care density	0.90 (0.79 – 1.03)	0.94 (0.82 – 1.07)
High care density	0.94 (0.82 – 1.07)	0.94 (0.83 – 1.08)
Avoidable outcome
<2 providers	1.67 (1.22 – 2.29)	1.62 (1.17 – 2.26)
Low care density	1.00	1.00
Middle care density	0.88 (0.70 – 1.11)	0.89 (0.70 – 1.13)
High care density	0.95 (0.75 – 1.19)	0.95 (0.76 – 1.20)
Lipid profile, angina
<2 providers	0.76 (0.33 – 1.74)	1.05 (0.43 – 2.54)
Low care density	1.00	1.00
Middle care density	2.55 (1.35 – 4.80)	2.24 (1.17 – 4.27)
High care density	1.58 (0.91 – 2.73)	1.49 (0.86 – 2.61)
Eye examination, diabetes
<2 providers	0.39 (0.26 – 0.59)	0.50 (0.32 – 0.77)
Low care density	1.00	1.00
Middle care density	1.45 (1.14 – 1.84)	1.33 (1.04 – 1.69)
High care density	1.31 (1.03 – 1.66)	1.28 (1.01 – 1.63)
Glycosylated hemoglobin or fructosamine testing, diabetes
<2 providers	0.45 (0.27 – 0.76)	0.39 (0.23 – 0.68)
Low care density	1.00	1.00
Middle care density	0.99 (0.75 – 1.31)	1.04 (0.78 – 1.38)
High care density	1.12 (0.85 – 1.48)	1.14 (0.86 – 1.50)

^*Analyses are adjusted for age, gender (except breast/prostate models), race, SEER site, cancer type, state buy-in, urban/rural residence, total number of visits, visit with PCP, and Charlson comorbidity index