Table 2.

Patient-reported presence of breast edema in patients receiving breast-conserving therapy (ie, breast-conserving surgery followed by radiotherapy)

	Breast edema*
Time intervals†	%  (95% CI)	n/N
Baseline	12.0  (9.8 to 14.1)	100/836
3 months	7.1  (5.3 to 8.8)	58/819
6 months	12.4  (10.0 to 14.7)	96/777
12 months	8.2  (6.1 to 10.2)	58/709
18 months	5.5  (3.6 to 7.3)	33/601

^*Edema was defined by the European Organisation for Research and Treatment of Cancer BR23 question 50  (“no edema” consists of “not at all” and “a little”; “edema” consists of “quite a bit” and “very much”). CI = confidence interval.

^†Baseline is after breast-conserving surgery but before radiotherapy; 3 months measurement is after the completion of radiotherapy  (and at least 2 months after the initiation of radiotherapy). Because this is an ongoing, actively recruiting cohort, the denominator decreases over time.