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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