Table 2.

Impact Factors* for Publications Resulting from Abstracts Submitted to the 2009 SGIM Annual Meeting

Variable		n	Median impact factor	p §
Site	Academic	268	2.8	0.63
	Community	6	2.5
Topic	VA-based research	11	3.0	0.007
	Health disparities/vulnerable populations	37	3.2
	Medical education	42	2.6
	Organization of care and chronic disease management	31	2.8
	Clinical epidemiology/health care effectiveness research	28	2.8
	Quality of care/patient safety	25	3.9
	Aging/geriatrics/end of life	23	3.9
	Preventive medicine	12	3.9
	Mental health/substance abuse	21	3.0
	Clinical decision-making and economic analysis	11	3.1
	Women’s health	10	2.8
	Cancer research	5	19.0
	Global health/preparedness	4	1.3
	Other†	14	3.9
Number of study sites	Single site	95	2.6	0.002
	Multicenter, USA	173	3.2
	Multicenter, international	6	1.5
Study design	Other‡	242	2.8	0.008
	Randomized controlled trial	26	3.9
	Systematic review/meta-analysis	5	8.2
Sample size	≤50	31	2.3	0.002
	51–100	29	2.1
	101–250	43	3.4
	251–500	45	3.1
	501–2000	43	3.3
	>2000	74	3.2
	Unknown	9	2.4
Abstract result	Negative	115	2.8	0.05
	Positive	134	3.3
	Not applicable	25	2.6

*The impact factor was extracted from the year the article was published

^†“Other” topics include health policy/advocacy/social justice, hospital-based medicine, medical humanities and ethics, personal/professional development, and research methods

^‡“Other” study designs were defined as non-experimental studies, including observational, case–control, and qualitative studies

^§Nonparametric analysis of variance (Kruskal–Wallis) test