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Table 2 Summary of the systematic reviews characteristics

From: A methodologic survey on use of the GRADE approach in evidence syntheses published in high-impact factor urology and nephrology journals

  Total SRs (n = 49) SRs of RCTs
(n = 20)
SRs of NRSs
(n = 15)
SRs of RCTs/NRSs
(n = 14)
Number of primary studies, median (range) 19 (5–104) 22 (5–90) 20 (7–104) 19 (5–61)
Number of participants, median (range) 4222 (484–2,791,732) 4253 (484–16,990) 14,550 (1394–2,791,732) 2958 (708–8163)
Summary of findings table, n 39 17 11 11
Meta-analysis conducted, n 46 20 13 13
Outcomes rated in a SR, median (range) 8 (1–184) 5 (1–249) 5 (1–78) 5 (1–68)
Category
 Clinical therapy, n 22 8 7 7
 Drug, n 14 10 1 3
 Specific clinical disease, n 6 0 4 2
 Lifestyle factors, n 3 0 3 0
 Supplements, n 2 1 0 1
 Clinical approach, n 1 0 0 1
 Clinical care, n 1 1 0 0
  1. NRSs Nonrandomized studies, RCTs Randomized controlled trials, SRs Systematic reviews