Table 2. Paired t-test on the percent of successful and erroneous critical care billing pre (2019-2020) to post (2020-2021) interventions for resident cohorts.

PGY: postgraduate year.

Cohort	Variable	n	Mean	Std. dev.	Min	Max	t-value	p-value
PGY1	Pre % successful	14	3.16	0.58	2.2	4.37	-4.78	0.0004
	Post % successful	14	8.55	4.35	4.51	19.59
PGY2	Pre % successful	14	5.65	2.22	2.57	9.7	-5.03	0.0002
	Post % successful	14	10.5	2.79	6.21	14.97
PGY3	Pre % successful	14	6.68	1.81	4.34	10.05	-4.77	0.0004
	Post % successful	14	12.92	5.2	7.46	25.47
PGY1	Pre % erroneous	14	0.75	0.41	0.11	1.65	-1.68	0.1161
	Post % erroneous	14	1.19	0.79	0.34	2.69
PGY2	Pre % erroneous	14	1.53	1.15	0.31	3.92	1.02	0.3253
	Post % erroneous	14	1.12	0.91	0	2.87
PGY3	Pre % erroneous	14	2.01	2.18	0.6	8.15	0.55	0.5894
	Post % erroneous	14	1.64	1.33	0.19	4.75