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Table 2 Summary of SF-8 items

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

  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
  1. 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