Table 4.

Test–retest reliability (n = 30)

	ICC (95% CI)	ME*	SDC†	Paired differences mean (95% CI)	P	LOA‡
SASS	0.985 (0.969–0.993)	0.293	0.812	0.033 (−0.121 to 0.188)	0.662	−0.778 to 0.844 (83.3%)

^*Measurement error (ME) was calculated as the square root of the residual variance.

^†Smallest detectable change (SDC) was calculated as 1.96*√2*ME.

^‡Limits of agreement (LOA) were calculated as the paired differences mean ±1.96*standard deviation of differences between two measurements (presented with the percentage of differences between test and rates, which are within the limits of agreement).

95% CI, 95% confidence interval; ICC, intraclass correlation coefficient; SASS, Smile Aesthetics Satisfaction Scale.