Evaluating the reliability and validity of SF-8 with a large representative sample of urban Chinese

Table 2 Summary of SF-8 items

	Mean¹	SD	% Floor	% Ceiling	Cronbach’s Alpha²	Item-total correlation
PF	51.0	5.3	0.2	67.3	0.81	0.68
RP	51.0	5.6	0.3	72.4	0.81	0.68
BP	56.8	6.4	0.3	66.0	0.82	0.64
GH	52.1	7.2	0.7	32.3	0.84	0.51
VT	53.9	9.2	3.9	38.5	0.85	0.39
SF	51.8	5.9	0.4	64.2	0.82	0.63
RE	49.2	5.5	0.3	68.1	0.83	0.58
MH	51.1	7.1	0.2	51.5	0.83	0.54

Note: ¹T-scores. ²Cronbach’s alpha if the item is removed; cut-off values: > 0.7 (acceptable), > 0.8 (good), and > 0.9 (excellent). ³Greater than 0.3 indicates acceptable

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