Table 3.

Reproducibility properties of unchanged patients at three months follow-up measurement

Health anchor (n = 74)
Instrument	ICC (95 % CI)	SEM	SEM%a	SDC	SDC%a
FI	0.85 (0.76; 0.91)	0.05	5 %	0.13	13 %
FP	0.65 (0.49; 0.77)	0.66	13 %	1.84	37 %
Functioning anchor (n = 80)
Instrument	ICC (95 % CI)	SEM	SEM%a	SDC	SDC%a
FI	0.84 (0.77; 0.90)	0.06	6 %	0.16	16 %
FP	0.77 (0.65; 0.84)	0.56	11 %	1.56	31 %

Notes: Intraclass correlation coefficient for agreement using a 2 way mixed effect model. ICC Intraclass Correlation Coefficient, FI Frailty Index; FP Frailty Phenotype; SDC smallest detectable change; SEM standard error of measurement.

^a. SEM% and SDC% are SEM and SDC expressed in percentages of the continuous score of the instrument