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

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

	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

ISSN: 1471-2474