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Table 2 Internal Consistency and Test–Retest Reliability of the Four Scales

From: Agreement between older adult patient and caregiver proxy symptom reports

Scales

Internal consistency reliability (Cronbach’s alpha)

Test–retest reliability (Intra-class correlation)

Patients, total

(n = 388)

(n = 121)

SymTrak

0.85

0.88

PHQ-8 depression

0.76

0.73

GAD-7 anxiety

0.84

0.80

PEG pain

0.90

0.87

Patients, non-dyadic

(n = 200)

(n = 62)

SymTrak

0.85

0.87

PHQ-8 depression

0.75

0.83

GAD-7 anxiety

0.83

0.85

PEG pain

0.89

0.81

Patients, dyadic

(n = 188)

(n = 59)

SymTrak

0.86

0.88

PHQ-8 depression

0.78

0.63

GAD-7 anxiety

0.85

0.74

PEG pain

0.92

0.92

Caregivers, dyadic

(n = 188)

(n = 65)

SymTrak

0.87

0.91

PHQ-8 depression

0.83

0.92

GAD-7 anxiety

0.87

0.74

PEG pain

0.94

0.96