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Table 2 Grading the strength of evidence

From: Comparison of patient satisfaction with mini-implant versus standard diameter implant overdentures: a systematic review and meta-analysis of randomized controlled trials

Comparison of parameters between standard and mini-implants for implant-supported overdenture:
Outcomes Parameter values No. of participants (studies) Quality of the evidence (GRADE)
QoL The mean QoL in the intervention groups was 4.76 lower (6.48 to 3.04 lower) than the control 177
(2 studies)

Lowa,b
GRADE Working Group grades of evidence
High quality: Further research is very unlikely to change our confidence in the estimate of effect.
Moderate quality: Further research is likely to have an important impact on our confidence in the estimate of effect and may change the estimate.
Low quality: Further research is very likely to have an important impact on our confidence in the estimate of effect and is likely to change the estimate.
Very low quality: We are very uncertain about the estimate.
  1. a The total number of study population was small in both the studies
  2. b Only two eligible studies have assessed the outcome parameters