Table 4.

Fit statistics for Internet Disorder Scale-Short Form (IDS9-SF) (n = 1988, # item of scale = 9)

Person	1988 input		1988 measured		Infit		Outfit
	Total	Count	Measure	RealSe	IMNSQ	ZStd	OMNSQ	ZStd
Mean	24.1	9.0	-0.32	0.32	1.00	0.0	1.00	0.00
SD	4.3	0.0	0.38	0.04	0.43	1.2	0.43	1.20
Real RMSE 0.32 True SD			0.20	Separation	0.62	Person reliability		0.28
Item	9 input		9 measured		Infit		Outfit
	Total	Count	Measure	RealSe	IMNSQ	ZStd	OMNSQ	ZStd
Mean	5313.4	1988	0.00	0.02	1.00	-.1	1.00	0.00
P.Sd	229.5	0.0	0.09	0.00	0.13	5.1	0.13	4.90
Real RMSE 0.02 True SD			0.09	Separation	4.32	Item reliability		0.95

RMSE: Root-mean-square error; IMNSQ: Infit mean square; ZSTD: Standardized; OMNSQ: Outfit mean square