Table 4:

Sensitivity analysis including network statistics of all physicians

	Degree	Normalized Degree	Clust. Coeff.
Patient has HMO	−0.065 (0.083)	0.276*** (0.039)	0.012*** (0.00048)
R-Squared	0.053	0.071	0.055
Number of Observations	1,000,955	1,000,955	1,000,955

Note: Robust standard errors in parentheses.

^*:p < 0.05,

^**:p < 0.01,

^***:p < 0.001 All regressions include controls for age, age squared, sex, an interaction of sex and age, 162 indicator variables for hierarchical condition categories (HCC), insurer fixed effects, and patient 3-digit ZIP code.