. 2015 Nov 23;33(36):4259–4267. doi: 10.1200/JCO.2015.61.9023

Table 2.

Adjusted Percentage of Patients Receiving Chemotherapy, by Age and RS Testing Receipt Status

Age Category, years	Received RS Testing	Percentage of Subgroup Receiving Chemotherapy	Percentage Point Difference in Chemotherapy Receipt Between RS Recipients and Nonrecipients (95% CI)	P
< 55	Yes (n = 286)	41.5	−19.2 (−27.9 to −10.6)	< .001
< 55	No (n = 447)	60.8	−19.2 (−27.9 to −10.6)	< .001
55-64	Yes (n = 317)	35.0	−5.9 (−13.6 to 1.8)	.13
55-64	No (n = 445)	41.0	−5.9 (−13.6 to 1.8)	.13
65-74	Yes (n = 695)	21.3	1.1 (−3.0 to 5.3)	.59
65-74	No (n = 1,831)	20.2	1.1 (−3.0 to 5.3)	.59
75-84	Yes (n = 300)	14.4	5.7 (0.4 to 11.0)	.036
75-84	No (n = 2,179)	8.7	5.7 (0.4 to 11.0)	.036
≥ 85	Yes (n = 11)	0.0	−2.3 (−3.4 to −1.3)	< .001
≥ 85	No (n = 776)	2.3	−2.3 (−3.4 to −1.3)	< .001

Abbreviation: RS, 21-gene recurrence score assay.