Table 2.

Error rates for all outcome variables for subgroup of attending radiologists (n = 5), with associated model-based p-values; “a” indicates results presented as model-based error rates per 1000 words ± standard error

Error Rates—Attending Subgroup
Error Type (Severity)	Without Mask a	With Mask a	P-Value
Incorrect Word (All)	10.9 ± 2.7	13.3 ± 1.4	0.054
Incorrect Word (Minor)	5.9 ± 0.9	7.5 ± 1.0	0.066
Incorrect Word (Moderate)	1.7 ± 0.4	1.6 ± 0.4	0.87
Incorrect Word (Major)	3.2 ± 0.9	4.1 ± 1.1	0.21
Missing Word (All)	2.9 ± 0.6	3.0 ± 0.7	0.86
Missing Word (Minor)	2.3 ± 0.5	2.2 ± 0.5	0.96
Missing Word (Moderate)	0.2 ± 0.2	0.3 ± 0.2	0.28
Missing Word (Major)	0.3 ± 0.1	0.3 ± 0.1	0.99
Additional Word (All)	1.4 ± 0.3	1.7 ± 0.3	0.74
Additional Word (Minor)	1.1 ± 0.3	1.1 ± 0.3	> 0.99
Additional Word (Moderate)	0.3 ± 0.08	0.4 ± 0.1	0.61
Additional Word (Major)	0.02 ± 0.02	0.06 ± 0.04	0.61
Erroroneous Phrase (Major)	0.4 ± 0.2	0.5 ± 0.2	0.49
Error in Term of Negation (Major)	0.08 ± 0.04	0.1 ± 0.05	0.74
Numeric Errors (All)	0.7 ± 0.2	0.9 ± 0.2	0.74
Incorrect Measurement (Moderate)	0.1 ± 0.08	0.2 ± 0.1	0.74
Incorrect Image Number (Moderate)	0.2 ± 0.1	0.2 ± 0.1	> 0.99
Incorrect Date/Time (Moderate)	0.2 ± 0.1	0.3 ± 0.1	0.74
Punctuation Errors (Minor)	0.3 ± 0.2	0.3 ± 0.2	0.74
All Minor Errors	9.8 ± 1.1	11.3 ± 1.3	0.2
All Moderate Errors	2.8 ± 0.6	3.1 ± 0.6	0.74
All Major Errors	4.3 ± 1.1	5.6 ± 1.3	0.11
All Errors	16.9 ± 1.9	20.1 ± 2.2	0.054