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Table 3 Cronbach’s alpha coefficient upon deletion of each item in the Scoliosis Japanese Questionnaire-27

From: Reliability and validity of a novel quality of life questionnaire for female patients with adolescent idiopathic scoliosis: Scoliosis Japanese Questionnaire-27: a multicenter, cross-sectional study

  Scale mean if item is deleted Scale variance if item is deleted Corrected item - total correlation Cronbach’s alpha if item is deleted
Q01 48.76 2 6 9 .2 0 9 .409 .912
Q02 48.20 2 6 0 .0 9 7 .525 .911
Q03 48.23 2 6 1 .9 1 7 .473 .911
Q04 47.82 2 6 2 .7 3 6 .349 .914
Q05 48.57 2 5 7 .8 5 0 .644 .909
Q06 48.43 2 5 6 .3 4 3 .588 .909
Q07 48.78 2 7 0 .1 3 7 .317 .914
Q08 48.54 2 5 8 .2 2 2 .600 .909
Q09 48.30 2 5 6 .6 5 6 .611 .909
Q10 48.35 2 5 1 .9 6 7 .729 .907
Q11 48.34 2 6 5 .7 3 3 .335 .914
Q12 48.12 2 6 1 .3 7 9 .430 .912
Q13 49.03 2 7 3 .2 2 9 .325 .913
Q14 48.68 2 5 8 .5 4 2 .663 .909
Q15 47.99 2 6 1 .8 2 7 .382 .914
Q16 48.59 2 7 1 .3 9 8 .234 .915
Q17 48.23 2 5 2 .7 1 4 .694 .907
Q18 47.10 2 5 4 .5 6 0 .560 .910
Q19 48.56 2 6 5 .0 8 2 .445 .912
Q20 48.30 2 5 7 .5 8 2 .575 .910
Q21 46.70 2 6 0 .1 0 3 .396 .914
Q22 48.90 2 6 7 .5 2 3 .552 .911
Q23 48.28 2 5 3 .5 3 9 .653 .908
Q24 48.34 2 5 3 .8 5 5 .659 .908
Q25 48.50 2 5 4 .5 7 0 .689 .908
Q26 48.63 2 6 2 .2 1 2 .545 .910
Q27 48.11 2 5 9 .6 2 0 .486 .911