Table 2.

Error rate formulas and week-to-week comparison

		Week 1			Week 2
Error rate	Formula	Reader 1	Reader 2	Total	Reader 1	Reader 2	Total
Errors per report	Total errors/total reports	200/219 = 0.91	550/223 = 2.47	750/442 = 1.7	356/350 = 1.02	906/381 = 2.38	1,262/731 = 1.73
Nongrammatical errors per report	Total nongrammatical errors/total reports	122/219 = 0.56	113/223 = 0.51	235/442 = 0.53	227/350 = 0.65	211/381 = 0.55	438/731 = 0.60
Percentage of reports with errors	((Total reports − reports with no errors)/total reports) × 100%	46.6%	71.7%	((442 − 180)/442) × 100% = 59%	48.6%	70.7%	((731 − 292)/731) × 100% = 60%
Percentage of reports with nongrammatical errors	(Total reports − Reports with no nongrammatical errors/Total reports) × 100%	31.5%	34.1%	((442 − 297)/442) × 100% = 33%	36.9%	35.2%	((731 − 468)/731) × 100% = 36%
Errors per dictated word	Total errors/Total dictated words	0.013	0.028	729/34,641 = 0.02	0.012	0.036	1,229/54,515 = 0.02

Total errors: week 1 = 750, week 2 = 1,262; total nongrammatical errors: week 1 = 235, week 2 = 438; reports with no errors: week 1 = 180, week 2 = 292; reports with no nongrammatical errors: week 1 = 297, week 2 = 468; total reports: week 1 = 442, week 2 = 731; total dictated words: week 1 = 34,641, week 2 = 54,515

Prepopulated standardized reports were used during week 1. Prepopulated templates were disabled during week 2; however, radiologists could still choose to select a standard template manually