Table 3.

PROMIS T-scores Corresponding to Depression Severity Categories in Present and Prior Studies

Study Method to Derive Categories	PROMIS Depression T-Score Equivalent
	Present Studya Patient Global Mood b	Present Studya Patient PHQ-9 Range Lower Bound c	Gibbons 2011 Patient PHQ-9 Range Lower Bound c	Amtmann 2014 Patient PHQ-9 Range Lower Bound c	Choi 2014 Patient PHQ-9 Range Lower Bound c	Pilkonis 2014 Patient PHQ-9 Range Mean d	Cella 2014 Clinical Expertse
Mild Depression	52	47	42	53	53	55	55
Moderate Depression	58	53	52	59	60	60	65
Moderately Severe Depression	65	60	64	65	66	66
Severe Depression	73	66	73	70	72	72	75

^aPresent study refers to data from all 3 trials combined in this paper.

^bTo the question about global mood in the past 7 days, responses of “mildly unhappy or down”, “moderately unhappy or down”, “severely unhappy or down”, and “very severely unhappy or down” are classified as mild, moderate, moderately severe, and severe.

^cT-score corresponding to PHQ-9 scores of 5, 10, 15, and 20 which represent the lower bound of mild, moderate, moderately severe, and severe depression.

^dMean T-score for patients with PHQ-9 scores of 5–9, 10–14, 15–19, and 20–27 which represent the ranges of mild, moderate, moderately severe, and severe depression.

^eT-score corresponding to what clinical experts considered mild, moderate and severe symptoms by rating symptom vignettes from PROMIS item bank data in 507 cancer patients.