Level of Evidence comparison between 2010 and 2015 AHA Guidelines Update

This color-coded bar graph shows a Level of Evidence comparison between 2010 and 2015 Guidelines Update. The 2010 Guidelines used only three Levels of Evidence, or L.O.E., to indicate the quality of data: L.O.E. A, B, and C. The 2015 Guidelines update uses two types of L.O.E. B evidence: L.O.E. B-R, which is randomized, and L.O.E. B-NR, which is non-randomized.  It also uses two types of L.O.E. C evidence: L.O.E. C-LD, indicating limited data, and L.O.E. C-EO to denote expert opinion. Note that one recommendation in the 2010 Guidelines publication has no listed L.O.E. In the graph, the number and percent of 2010 Guidelines recommendations for each Level of Evidence are depicted with a blue bar, while the number and percent of 2015 Guidelines recommendations for each Level of Evidence are depicted with an orange bar. The graph depicts the following. There were a total of 685 2015 Guidelines recommendations and 315 2015 Guidelines Update recommendations. 57 (or 8.3%) of the 2010 Guidelines recommendations coincided with L.O.E. A as compared to 3 (or 1%) of the 2015 Guidelines Update recommendations. 256 (or 37.4%) of the 2010 Guidelines recommendations coincided with L.O.E. B, which was replaced in 2015 with L.O.E. B-R and B-NR. 50 (or 15%) of the 2015 Guidelines Update recommendations coincided with L.O.E. B-R. 46 (or 15%) of the 2015 Guidelines Update recommendations coincided with L.O.E. B-NR. 372 (or 54.3%) of the 2010 Guidelines recommendations coincided with L.O.E. C, which was replaced in 2015 with L.O.E.s C-LD and C-EO. 145 (or 46%) of the 2015 Guidelines Update recommendations coincided with L.O.E. C-LD. 73 (or 23%) of the 2015 Guidelines Update recommendations coincided with L.O.E. C-EO. This figure is copyright 2015 by the American Heart Association. There is a caption beneath this Figure which reads: “Level of Evidence comparison between 2010 Guidelines and 2015 Guidelines Update. B-R indicates Level of Evidence B-Randomized; B-NR, Level of Evidence B-Nonrandomized; C-LD, Level of Evidence C-Limited Data; and C-EO, Level of Evidence C-Expert Opinion. (One recommendation in the 2010 Guidelines publication has no listed LOE.)”