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Table 4 Cronbach alpha coefficient estimation before and after the-items-selection procedure

From: Development and validation of the FRAGIRE tool for assessment an older person’s risk for frailty

Dimension Items Before selection (Pre-grid) After selection (Final grid)
Cronbach's alpha 95% Bootstrap CI Cronbach's alpha 95% Bootstrap CI
General health status Q1, Q2 0.80 0.73–0.85 NA NA
Psychological well-being Q5, Q6, Q7a†, Q8, Q9 a, Q10 a, Q11, Q12, Q13, Q14 a, Q15 a, Q16 a †, Q17, Q19 a † 0.82 0.79–0.84 0.66 0.60–0.71
Cognitive impairment Q20 a †, Q21 a † 0.47 0.29–0.60 0.47 0.29–0.60
Environmental Q24 a †, Q25 a, Q29 a, Q30 0.52 0.40–0.62 0.13 −0.08–0.31
Cultural Q31, Q32 0.36 0.11–0.55 0.36 0.11–0.55
Sexual Q33 a, Q34 a †, Q35, Q36 0.38 0.24–0.49 0.03 −0.20–0.18
Burden of help   NA NA NA NA
Nutritional Q40 a †, Q41 a †, Q42 a, Q43 a 0.62 0.51–0.71 0.32 0.12–0.51
Neurosensory Q48 a †, Q50 a † 0.33 0.11–0.48 0.33 0.11–0.48
Mobility Q55 a †, Q56 0.53 0.42–0.62 NA NA
Section for examiner Q63, Q64, Q65 0.86 0.82–0.89 0.73 0.65–0.80
Overall Q1, Q2, Q5, Q6, Q7 a †, Q8, Q9 a, Q10 a, Q11, Q12, Q13, Q14 a, Q15 a, Q16 a †, Q17, Q19 a †, Q20 a †, Q21 a †, Q24 a †, Q25 a, Q29 a, Q30, Q31, Q32, Q33 a, Q34 a †, Q35, Q36, Q40 a †, Q41 a †, Q42 a, Q43 a, Q48 a †, Q50 a, Q55 a †, Q56 a, Q63, Q64, Q65 0.86 0.84–0.88 0.69 0.64–0.73
  1. a is an item with reverse quotation; , Item selected in the final grid ; CI confidential interval, NA not available