Table 2.

Impact factor of the randomised controlled trials referenced in the 2015 American Heart Association guidelines update for cardiopulmonary resuscitation and emergency cardiovascular care (n=273)

Characteristics	Values
Journal IF (2017), median (IQR)	5.9 (3.7–16.8)
Journal IF (year of publication), median (IQR)	3.6 (1.6–6.4)
Journal IF (2017), n (%)
IF<5	100 (36.6)
5≤IF<10	95 (34.8)
IF≥10	78 (28.6)
Journal IF (year of publication), n (%)
IF<5	181 (66.3)
5≤IF<10	33 (12.1)
IF≥10	59 (21.6)
Top 20 high-IF journals, n (%), IF (2017)	158 (57.9)
New England Journal of Medicine	32 (11.7), 79.258
The Lancet	11 (4.0), 53.254
Journal of the American Medical Association, JAMA	8 (2.9), 47.661
European Heart Journal	4 (1.5), 23.425
British Medical Journal, BMJ	2 (0.7), 23.295
Archives of Internal Medicine	1 (0.4), 19.989
Circulation	9 (3.3), 18.880
Journal of the American College of Cardiology	5 (1.8), 16.834
Intensive Care Medicine	4 (1.5), 15.008
JAMA Pediatrics	2 (0.7), 10.769
JACC: Cardiovascular Intervention	1 (0.4), 9.881
Clinical Infectious Disease	2 (0.7), 9.117
Chest	1 (0.4), 7.652
Neurology	1 (0.4), 7.609
Critical Care Medicine	12 (4.4), 6.630
Anesthesiology	2 (0.7), 6.523
Circulation: Cardiovascular Intervention	1 (0.4), 6.504
Stroke	1 (0.4), 6.239
Addiction	1 (0.4), 5.953
Resuscitation	58 (21.2), 5.863
Topics, IF, median (IQR)
BLS	15.0 (5.9–79.3)
ACLS	5.9 (4.7–59.8)
Postcardiac arrest care	15.0 (6.6–47.7)
Acute coronary syndrome	18.9 (5.2–53.3)
Neonatal and paediatric resuscitation	3.7 (2.3–5.5)
Education	5.9 (2.6–5.9)
Others	5.9 (5.4–18.9)
Type of intervention, IF, median (IQR)
Drug trial	18.9 (4.7–79.3)
Non-drug trial	5.9 (3.6–10.1)

ACLS, adult advanced cardiovascular life support; BLS, basic life support; IF, impact factor; JCR, Journal Citation Reports.