Dr. Pawan LalMBBS, MS (Surgery), DNB (Surgery), MNAMS, FIAS, FICS, FIAGES, FIMSA, DA. Professor of Surgery, Maulana Azad Medical College, New Delhi, India. Email:info@pawanlal.com, M: +91 9968604405
Levels of Evidence
 
Levels of evidence range from I to IV as shown below
 
Ia - Evidence from Meta-analysis of Randomized Controlled Trials
Ib - Evidence from at least one Randomized Controlled Trial
IIa - Evidence from at least one well designed controlled trial which is not randomized
IIb - Evidence from at least one well designed experimental trial
III - Evidence from case, correlation, and comparative studies.
IV - Evidence from a panel of experts