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Table 3 Internal consistency according to subscale by the intraclass correlation coefficient (ICC) and Cronbach’s alpha

From: Validation of the severe respiratory insufficiency questionnaire for Chile

SRI dimensions

Number of items

ICC (95% CI) SRI Chile

Cronbach’s α SRI Chile

Cronbach’s α SRI Germany

Cronbach’s α SRI Spain

Respiratory complaints (RC)

8

0.84 (0.63–0.94)

0.84

0.83

0.81

Physical functioning (PF)

6

0.94 (0.85–0.98)

0.73

0.80

0.82

Attendant symptoms and sleep (AS)

7

0.91 (0.78–0.96)

0.71

0.76

0.73

Social relationships (SR)

6

0.92 (0.80–0.97)

0.72

0.73

0.63

Anxiety (AX)

5

0.95 (0.87–0.98)

0.78

0.79

0.73

Psychosocial well-being (WB)

9

0.93 (0.83–0.97)

0.82

0.89

0.85

Social functioning (SF)

8

0.91 (0.77–0.96)

0.80

0.84

0.82

SRI global (summary scale)

49

0.97 (0.92–0.99)

0.95

0.89

0.93