A Comparison of Depressive Symptom Presentation in Adolescent Type 1 Diabetes and Pediatric Primary Care Samples

Table 3

PHQ-9 corrected item–total correlations and Cronbach’s α if item deleted.

Reliability (Cronbach’s α)	T1D (N = 477)		Primary care (N = 477)
	0.83		0.82
Item	r^a	α^b	r^a	α^b
Down and depressed	0.62	0.80	0.63	0.80
Little interest or pleasure	0.53	0.81	0.50	0.81
Trouble falling asleep	0.59	0.81	0.58	0.80
Poor appetite	0.50	0.81	0.52	0.81
Fatigue	0.58	0.81	0.64	0.79
Feeling bad about self	0.58	0.81	0.56	0.80
Trouble concentrating	0.56	0.81	0.54	0.81
Moving or talking slowly	0.52	0.82	0.44	0.82
Thoughts of self-harm	0.47	0.82	0.45	0.82

Note. ^ar represents corrected item–total correlation. ^bIndicates internal consistency of remaining items if the selected item is deleted from the total score.