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. Author manuscript; available in PMC: 2015 Dec 1.
Published in final edited form as: Cancer. 2014 Oct 27;120(23):3722–3730. doi: 10.1002/cncr.28908

Table 3.

Results of Cox multiple regression analyses with the individual breast (R or L) as the unit of analysis and current age as time

Explanatory variable Model I Model II*
HR 95% CI p-value HR 95% CI p-value
log(1+chest dose)-ipsilateral 1.96 1.45–2.69 <0.001
log(1+flank dose)-ipsilateral 1.09 0.88–1.35 0.438 1.51 1.13–2.03 0.005
Doxorubicin 2.24 0.80–6.22 0.123 1.49 0.36–6.19 0.581
Age@WT≥10 years 4.59 1.88–11.2 0.001 14.61 4.20–50.1 <0.001
*

Subgroup of 2,123 participants who did NOT receive chest RT