Table 3.

Participant-reported fatigue by intervention period.

Outcome	Values, mean (SD)					Values, mean difference (95% CI)
	Baseline	UCa	DLb	BLc	UC vs baseline		DL vs baseline	BL vs baseline
PROMISd daily fatigue	58 (8)	54 (8)	53 (9)	53 (9)	−3.7e (−5.1 to −2.4)		−5.2e (−7.1 to −3.3)	−5.3e (−7.0 to −3.5)
PROMIS weekly fatigue	61 (6)	58 (6)	55 (7)	56 (7)	−3.0e (−4.2 to −1.9)		−5.3e (−6.9 to −3.8)	−5.4e (−7.1 to −3.7)
EMAf fatigue	5.20 (1.74)	4.62 (1.82)	4.26 (1.91)	4.18 (1.83)	−0.62e (−0.94 to −0.31)		−1.00e (−1.40 to −0.59)	−1.00e (−1.30 to −0.59)

^aUC: usual care.

^bDL: dim light.

^cBL: bright light.

^dPROMIS: Patient-Reported Outcomes Measurement Information System.

^eP values for paired samples t tests: P<.001.

^fEMA: ecological momentary assessment.