Table 3.

Initiation of RT: Results from multivariate logistic regression (n = 774)

Effect	More:Less likely to begin RT	OR (95% CI)	p
Treatment arm	ID:HD	2.66 (1.65–4.27)	<0.0001
Age (y)	40:60	2.22 (1.27–3.92)	0.005
Race*	Non-AA:AA	2.99 (1.45–6.17)	0.003
Surgery	Nonmastecomy: mastectomy	2.10 (1.12–3.94)	0.02
Tumor ER status	Negative: positive	1.72 (1.06–2.78)	0.03
Race × age interaction			0.07
Age <50 y	Non-AA:AA	1.83 (0.76–4.41)
Age ≥50 y	Non-AA:AA	9.43 (2.08–43.48)

Abbreviations: AA= African American; ER = estrogen receptor. other abbreviations as in Table 1.

^*Main effects of race and age tested in the absence of the interaction term.