Table 1.

Model-based error rates for all outcome variables for all participating radiologists (n = 6), with associated model-based p-values; “a” indicates results presented as model-based error rates per 1000 words ± standard error

Error Rates ‐ All Participants
Error Type (Severity)	Without Mask a	With Mask a	P‐Value
Incorrect Word (All)	14.3 ± 2.7	15.9 ± 2.9	0.11
Incorrect Word (Minor)	7.2 ± 1.2	8.5 ± 1.4	0.067
Incorrect Word (Moderate)	2.6 ± 0.9	2.2 ± 0.8	0.27
Incorrect Word (Major)	3.9 ± 1.0	5.0 ± 1.3	0.044
Missing Word (All)	3.5 ± 0.9	4.3 ± 1.1	0.049
Missing Word (Minor)	2.7 ± 0.6	3.0 ± 0.7	0.37
Missing Word (Moderate)	0.3 ± 0.2	0.6 ± 0.4	0.001
Missing Word (Major)	0.4 ± 0.1	0.4 ± 0.1	0.99
Additional Word (All)	1.7 ± 0.4	2.0 ± 0.4	0.39
Additional Word (Minor)	1.1 ± 0.2	0.1 ± 0.2	0.58
Additional Word (Moderate)	0.3 ± 0.08	0.5 ± 0.1	0.27
Additional Word (Major)	0.02 ± 0.02	0.07 ± 0.03	0.27
Erroroneous Phrase (Major)	0.6 ± 0.3	0.8 ± 0.3	0.29
Error in Term of Negation (Major)	0.1 ± 0.05	0.2 ± 0.1	0.018
Numeric Errors (All)	1.1 ± 0.4	1.3 ± 0.5	0.27
Incorrect Measurement (Moderate)	0.2 ± 0.1	0.3 ± 0.2	0.33
Incorrect Image Number (Moderate)	0.3 ± 0.1	0.4 ± 0.2	0.27
Incorrect Date/Time (Moderate)	0.3 ± 0.2	0.4 ± 0.2	0.63
Punctuation Errors (Minor)	0.4 ± 0.3	0.7 ± 0.6	< 0.0001
All Minor Errors	11.9 ± 2.6	15.2 ± 3.2	0.0002
All Moderate Errors	4.1 ± 1.3	4.3 ± 1.4	0.63
All Major Errors	5.6 ± 1.6	7.3 ± 2.0	0.008
All Errors	21.7 ± 4.9	27.1 ± 6.0	< 0.0001