Table 2.

Components of variance for preventability assessments, represented as proportions of the total variance for an individual assessment, with 95% CIs

Study	Scale	Case note	Reviewer	Residual error	Reliability of a single review
UK study	Likert	0.27 (0.19 to 0.39)	0.14 (0.05 to 0.34)	0.58 (0.44 to 0.71)	0.27
	Raw percentage	0.27 (0.19 to 0.36)	0.09 (0.04 to 0.21)	0.64 (0.54 to 0.73)	0.27
US study	Likert	0.23 (0.10 to 0.36)	0.17 (0.04 to 0.31)	0.60 (0.45 to 0.75)	0.23
	Raw percentage	0.22 (0.11 to 0.33)	0.07 (0.00 to 0.15)	0.71 (0.58 to 0.83)	0.22

The Likert variance decomposition refers to latent scales (the true score latent variable).