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Table 2 Item-deleted Cronbach’s alpha, corrected item-total correlation and response trend for each item in the SC-SFI

From: Cross-cultural validation of simplified Chinese version of spine functional index

  Item-deleted Cronbach’s Alpha Corrected item-total correlation Z-skewness
Item 1 0.91 0.45 0.19
Item 2 0.91 0.41 0.14
Item 3 0.90 0.65 0.92
Item 4 0.91 0.42 0.53
Item 5 0.90 0.58 0.24
Item 6 0.91 0.33 0.07
Item 7 0.91 0.47 1.02
Item 8 0.91 0.33 −0.76
Item 9 0.90 0.51 0.36
Item 10 0.90 0.69 0.52
Item 11 0.90 0.66 0.61
Item 12 0.91 0.31 0.17
Item 13 0.90 0.51 1.58
Item 14 0.90 0.54 0.68
Item 15 0.91 0.44 0.57
Item 16 0.91 0.38 0.07
Item 17 0.90 0.48 0.97
Item 18 0.91 0.43 1.60
Item 19 0.91 0.47 1.17
Item 20 0.90 0.58 0.06
Item 21 0.90 0.61 0.63
Item 22 0.90 0.66 0.84
Item 23 0.90 0.62 0.68
Item 24 0.90 0.51 0.31
Item 25 0.90 0.56 0.98