Table 2. Representative of Survey Responders to the Sampling Frame.

Category		Sampling Frame		Completed and Valid Responses		p-value
Category	Category Value	N	%	N	%	p-value
Race/Ethnicity	Missing	1473	30.8	60	18.1	p = 0.34
	American Indian or Alaska Native	6	0.1	0	0.0
	Asian	416	8.7	25	7.5
	Black or African American	147	3.1	10	3.0
	Hispanic/Latinx	64	1.3	3	0.9
	Middle Eastern or North African	19	0.4	1	0.3
	Multi-racial	53	1.1	3	0.9
	Native Hawaiian or other Pacific Islander	11	0.2	0	0.0
	Other race	103	2.2	4	1.2
	Prefer not to answer	58	1.2	4	1.2
	White	2441	51.0	222	66.9
	Total	4791	100.0	332	100.0
Board	American Board Emergency Medicine (ABEM)	589	12.3	32	9.6	p < 0.001
	American Board Family Medicine (ABFM)	3054	63.8	253	76.2
	American Board Pediatrics (ABP)	369	7.7	24	7.2
	American Board Physical Medicine and Rehabilitation (ABPMR)	779	16.3	23	6.9
	Total	4791	100.0	332	100.0
Gender	Female	1274	26.6	87	26.2	p = 0.66
	Male	3276	68.4	232	69.9
	Missing	176	3.7	11	3.3
	Other	65	1.4	2	0.6
	Total	4791	100.0	332	100.0
Medical School	International Medical Graduate (IMG)	573	12.0	34	10.2	p = 0.42
	Missing	268	5.6	15	4.5
	United States Medical Graduate USMG	3950	82.5	283	85.2
	Total	4791	100.0	332	100.0
Degree	Missing	14	0.3	1	0.3	p = 0.74
	DO	1090	22.8	63	19.0
	MBBCH	1	0.0	0	0.0
	MBBS	13	0.3	1	0.3
	MBCHB	2	0.0	0	0.0
	MD	3671	76.6	267	80.4
	Total	4791	100.0	332	100.0
Initial Certification Year	1993	59	1.2	7	2.1	p =0.06
	1995	66	1.4	4	1.2
	1997	92	1.9	7	2.1
	1999	99	2.1	7	2.1
	2001	86	1.8	12	3.6
	2002	44	0.9	3	0.9
	2003	57	1.2	7	2.1
	2004	67	1.4	5	1.5
	2005	80	1.7	4	1.2
	2006	85	1.8	7	2.1
	2007	125	2.6	11	3.3
	2008	168	3.5	16	4.8
	2009	146	3.1	16	4.8
	2010	153	3.2	15	4.5
	2011	186	3.9	14	4.2
	2012	160	3.3	18	5.4
	2013	195	4.1	14	4.2
	2014	210	4.4	14	4.2
	2015	246	5.1	15	4.5
	2016	265	5.5	8	2.4
	2017	255	5.3	12	3.6
	2018	283	5.9	21	6.3
	2019	309	6.5	14	4.2
	2020	284	5.9	9	2.7
	2021	339	7.1	26	7.8
	2022	358	7.5	27	8.1
	2023	374	7.8	19	5.7
	Total	4791	100.0	332	100.0