Table 4.

Known groups validity: PROMIS Fatigue Short Form 6a T-score by dysmenorrhea and NMPP responder status at months 3 and 6

Time	Outcome	Responders		Non-responders		F-testa
		N	Mean (SD)	N	Mean (SD)	F	P-value
Month 3	Dysmenorrheab	351	54.5 (10.0)	381	59.1 (8.8)	42.78	< 0.0001
	NMPPc	397	54.4 (9.5)	335	59.8 (9.0)	62.62	< 0.0001
Month 6	Dysmenorrheab	292	52.9 (10.2)	281	59.7 (8.8)	73.64	< 0.0001
	NMPPc	321	53.2 (10.0)	252	60.2 (8.8)	78.10	< 0.0001

NMPP Non-menstrual pelvic pain, PROMIS Patient-Reported Outcome Measurement Information System, SD Standard deviation

^aGeneral linear model controlling for age and baseline Fatigue score

^bPain due to endometriosis over the last 28 days during menstruation

^cPain due to endometriosis over the last 28 days when the patient was not menstruating