Table 2.

Descriptive statistics for 5,140 participants on the GAD-2 and PHQ-2 items of the PHQ-4, and interitem correlations (covariances) and reliability

Item	n	Mean	SD	Skewness	Kurtosis	Item-rest or corrected item-total Correlation	Cronbach’s α	Composite reliability
GAD-2 items ( n  = 5,140)
Item1: Nervousness	5,140	0.85	1.03	0.94	2.63	0.83
Item 2: Worries	5,140	0.82	1.04	0.99	2.67	0.83
GAD-2 scale		1.67	1.97	0.96	2.70		0.90	0.90
PHQ-2 items ( n  = 5,140)
Item 3: Loss of interest	5,140	0.80	1.01	1.00	2.75	0.76
Item 4: Depressive mood	5,140	0.80	1.01	1.02	2.81	0.84
PHQ-2 scale		1.60	1.89	0.98	2.83		0.86	0.86
Total scale score: PHQ-4 ( n  = 5,140)		3.28	3.67	0.95	2.78		0.92	0.92

Note: SD = standard deviation. α = Cronbach’s alpha