Table 2.

Internal reliability of 2 depression screening questionnaires at 3 sampling timepoints in adults with glioma

	T1				T2				T3
	Alpha	Mean (SD)	Item-Total Correlation	Alpha (if item deleted)	Alpha	Mean (SD)	Item-Total Correlation	Alpha (if item deleted)	Alpha	Mean (SD)	Item-Total Correlation	Alpha (if item deleted)
HAD-D	0.82				0.82				0.77
Enjoying things as usual		0.7 (1.0)	0.69	0.77		0.7 (0.9)	0.62	0.79		0.4 (0.7)	0.54	0.73
Seeing the funny side		0.3 (0.6)	0.63	0.79		0.3 (0.6)	0.67	0.79		0.2 (0.5)	0.42	0.76
Feeling cheerful		0.4 (0.6)	0.60	0.79		0.4 (0.6)	0.67	0.79		0.3 (0.6)	0.60	0.72
Feeling slowed down		1.5 (1.0)	0.42	0.83		1.5 (1.0)	0.44	0.82		1.3 (1.1)	0.44	0.77
Losing interest in appearance		0.3 (0.6)	0.47	0.81		0.5 (0.8)	0.53	0.80		0.4 (0.7)	0.44	0.75
Looking forward to things		0.5 (0.8)	0.68	0.77		0.5 (0.8)	0.70	0.77		0.3 (0.6)	0.67	0.71
Enjoying book/radio/TV		0.4 (0.7)	0.56	0.79		0.5 (0.8)	0.44	0.82		0.3 (0.7)	0.46	0.75
PHQ-9	0.81				0.86				0.85
Little interest or pleasure		0.6 (0.9)	0.68	0.78		0.5 (0.9)	0.63	0.84		0.4 (0.8)	0.67	0.83
Depressed mood		0.5 (0.7)	0.67	0.78		0.5 (0.8)	0.72	0.84		0.4 (0.7)	0.65	0.84
Sleep change		1.1 (1.2)	0.53	0.79		0.8 (1.1)	0.53	0.86		1.0 (1.2)	0.54	0.85
Feeling fatigued		1.4 (1.1)	0.51	0.80		1.3 (1.0)	0.69	0.84		1.1 (1.1)	0.74	0.82
Appetite change		1.0 (1.2)	0.52	0.80		0.8 (1.0)	0.58	0.85		0.6 (1.0)	0.54	0.84
Feeling bad about self		0.5 (0.9)	0.42	0.81		0.4 (0.8)	0.69	0.84		0.4 (0.7)	0.68	0.83
Trouble concentrating		1.0 (1.1)	0.56	0.79		0.5 (0.9)	0.58	0.85		0.5 (0.8)	0.63	0.83
Psychomotor changes		0.6 (0.9)	0.51	0.79		0.6 (0.9)	0.55	0.85		0.4 (0.8)	0.50	0.85
Suicidal ideas		0.1 (0.4)	0.31	0.82		0.1 (0.4)	0.42	0.86		0.1 (0.3)	0.47	0.86

T1, T2, T3 are first, second, and third sampling timepoints, respectively. Item stems are paraphrased from original scales for brevity.

For mean scores, each item had a maximum score of 3.