Table 2a.

5-year risks (%), and hazard ratios (HRs) of breast cancer-related lymphedema following surgery, by follow-up length (FU), for age and race among women with breast cancer (stage I-III) in the Carolina Breast Cancer Study (Phase 3, diagnosis years 2008-2013)

	5-year risk (%)		Hazard ratio (95% confidence interval)a
Age (yr)	Non-Black	Black	Non-Black	Black FU ≤ 7 months	Black FU > 7 months
50+	16.5 (13.6, 19.4)	23.2 (19.7, 26.7)	1	1.21 (0.85, 1.74)	1.86 (1.29, 2.66)
<50	19.3 (16.1, 22.5)	35.0 (30.8, 39.2)	1	1.68 (1.15, 2.44)	2.12 (1.59, 2.82)
Overall	17.9 (15.7, 20.0)	28.8 (26.1, 31.6)	1	1.42 (1.09, 1.83)	1.98 (1.58, 2.47)
Race	Age 50+ yr	Age <50 yr	Age 50+ yr	Age <50 yr FU ≤ 7 months	Age <50 yr FU > 7 months
Non-Black	16.5 (13.6, 19.4)	19.3 (16.1, 22.5)	1	0.80 (0.54, 1.17)	1.69 (1.19, 2.42)
Black	23.2 (19.7, 26.7)	35.0 (30.8, 39.2)	1	1.09 (0.77, 1.54)	1.94 (1.45, 2.59)
Overall	19.6 (17.4, 21.9)	26.3 (23.7, 28.9)	1	0.94 (0.73, 1.22)	1.80 (1.43, 2.25)

^a.Cox proportional hazards model for race was only adjusted for age; Cox proportional hazards model for age was only adjusted for race.