Appendix Table 1.

Multivariate models examining the effect of the tracking and feedback intervention and patient characteristics on rates of underuse of adjuvant treatment among women whose breast cancer surgeons participated in both the pre- and the postintervention periods (limited population) and among women operated on by any surgeon participating in the study (entire population)^*

	Limited population (n = 574)	Entire population (n = 939)
Characteristic	OR (95% CI)	OR (95% CI)
Intervention	0.6 (0.3 to 0.9)	0.6 (0.4 to 0.9)
Age ≥70 y	3.0 (1.8 to 4.9)	2.5 (1.8 to 3.6)
Comorbidity	2.3 (1.4 to 3.8)	1.9 (1.3 to 2.8)
Stage IIA	0.8 (0.5 to 1.3)	0.8 (0.6 to 1.2)
Stage IIB	0.5 (0.2 to 1.0)	0.5 (0.3 to 0.9)
No insurance	2.3 (0.9 to 5.7)	1.5 (0.7 to 3.0)
Black or Hispanic	0.7 (0.4 to 1.3)	1.1 (0.7 to 1.7)

^*Hierarchical linear models take into account clustering by surgeon and hospital. The limited population includes patients operated on by the 19 surgeons who participated in both the pre- and postintervention periods. The entire population includes all patients operated on by the 51 preintervention and the 28 postintervention surgeons.