“…Although IL-6 levels in DR (5) has been previously examined to some extent 234 , this present meta-analysis has included additional studies 62 , 65 , 73 , 78 , 79 , 82 , 91 , 92 , 96 , 99 , 101 , 103 , 109 – 112 , 114 , 117 – 120 . The IL-6 levels were found to be higher in DR than in control group (SMD = 2.21, 95% CI 1.74–2.69, P < 0.00001).…”