Table 6.

Correlations between change in PRO measures and change in VAS

	FACT-B TOI		PROMIS fatigue		PROMIS anxiety		PROMIS ability to participate in social roles and activities
	Completion of RT − baseline	6 mo. - completion of RT	Completion of RT - baseline	6 mo. - completion of RT	Completion of RT - baseline	6 mo. - completion of RT	Completion of RT - baseline	6 mo. - completion of RT
VAS, completion of RT − baseline	0.387 <.001 n = 550	—	−0.292 <.001 n = 560	—	0.172 <.001 n = 562	—	0.328 <.001 n = 554	—
VAS, 6 mo. − completion of RT	—	0.450 <.001 n = 549	—	−0.335 <.001 n = 561	—	−0.272 <.001 n = 561	—	0.309 <.001 n = 555

Entries in table denote Pearson correlation coefficient, P value, and sample size. —: not applicable. Completion of RT − baseline: Score at the completion of RT minus score at baseline. 6 mo. − completion of RT: Score at 6 months after the completion of RT minus score at the completion of RT. For FACT-B TOI, higher scores represent better health-related quality of life. For PROMIS, higher scores represent more of the outcome, eg, more fatigue, more anxiety, better ability. The VAS ranges from 0 (worst imaginable health) to 100 (best imaginable health).

Abbreviations: FACT-B TOI = Functional Assessment of Cancer Therapy-Breast Trial Outcome Index; PRO = patient-reported outcome; PROMIS = Patient-Reported Outcomes Measurement Information System; RT = radiation therapy; VAS = Visual Analog Scale from the EQ-5D.