Table 5.

Reproducibility of Tinnitus Functional Index (TFI) scores: Intra-class correlations (ICC) and limits of agreement between two administrations. The TFI showed excellent stability over time as indicated by the high ICC values and acceptable test-retest agreement. Although most of the subscales were below 95% limits of agreement, it only suggested marginal measurement error. The smallest detectable change scores for the global TFI and subscales are comparable to the limits of agreement. ICC = Intra-class correlations; Mean diff = the mean difference scores between the repeated measure; SEM = Standard error of measurement; SDC = Smallest detectable change.

N = 44	Mean (±SD)		Reliability	Agreement
Scale	Baseline	Retest	ICC (95%CI)	Mean diff	SEM	SDC	Limits of agreement	% of agreement
Tinnitus Functional index	45.3 (±20.1)	45.6(±19.4)	0.91 (0.84–0.95)	−0.3	8.1	22.4	22.2–22.7	93.2%
Intrusiveness	57.1 (±19.1)	58.8 (±21.3)	0.92 (0.82–0.96)	−1.7	7.6	21.1	19.4–22.7	93.2%
Sense of control	58.1 (±22.8)	57.6 (±20.9)	0.81 (0.65–0.90)	0.5	12.5	34.8	35.3–34.2	95.5%
Cognitive	39.2 (±38.2)	41.9 (±24.3)	0.89 (0.79–0.94)	−2.6	11.8	32.8	30.2–35.5	93.2%
Sleep	41.9 (±31.6)	41.2 (±30.1)	0.91 (0.83–0.95)	0.7	12.8	35.5	36.2–34.8	93.2%
Auditory	33.9 (±29.7)	36.1 (±30.2)	0.95 (0.90–0.97)	−2.3	9.6	26.6	24.3–28.9	93.2%
Relaxation	64.6 (±25.9)	62.9 (±25.3)	0.83 (0.69–0.91)	1.7	13.9	38.5	40.3–36.8	88.6%
Quality of life	35.1 (±26.1)	34.0 (±24.6)	0.86 (0.75–0.92)	1.1	12.6	34.9	36.0–33.8	93.2%
Emotional	36.0 (±28.1)	36.6 (±27.5)	0.87 (0.77–0.93)	−0.6	13.3	36.8	36.2–37.4	91.0%