Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

4,752 questions · 6,648 findings · 688 reviews

No studies found 1,125 · 16.9%GRADE not reported 670 · 10.1%Very low 1,796 · 27%Low 1,685 · 25.3%Moderate 1,075 · 16.2%High 297 · 4.5%

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Summary of findings table ‐ Metformin + levonorgestrel (intrauterine system) vs levonorgestrel intrauterine system

Abnormal uterine bleeding · endometrial hyperplasia

It is very uncertain whether summary of findings table ‐ Metformin + levonorgestrel (intrauterine… changes abnormal uterine bleeding compared with levonorgestrel intrauterine system (very low certainty).

1 finding from 1 review

Summary of findings table ‐ Metformin + levonorgestrel (intrauterine system) vs levonorgestrel intrauterine system

Adverse effects during treatment ‐ all effects · endometrial hyperplasia

It is very uncertain whether summary of findings table ‐ Metformin + levonorgestrel (intrauterine… changes adverse effects during treatment ‐ all effects compared with levonorgestrel intrauterine system (very low certainty).

1 finding from 1 review

Summary of findings table ‐ Metformin + levonorgestrel (intrauterine system) vs levonorgestrel intrauterine system

Adverse events: nausea · endometrial hyperplasia

It is very uncertain whether summary of findings table ‐ Metformin + levonorgestrel (intrauterine… changes adverse effects during treatment ‐ nausea compared with levonorgestrel intrauterine system (very low certainty).

1 finding from 1 review

Summary of findings table ‐ Metformin + levonorgestrel (intrauterine system) vs levonorgestrel intrauterine system

Adverse effects during treatment ‐ heaviness in lower abdomen · endometrial hyperplasia

It is very uncertain whether summary of findings table ‐ Metformin + levonorgestrel (intrauterine… changes adverse effects during treatment ‐ heaviness in lower abdomen compared with levonorgestrel intrauterine system (very low certainty).

1 finding from 1 review

Summary of findings table ‐ Metformin + levonorgestrel (intrauterine system) vs levonorgestrel intrauterine system

Adverse effects during treatment ‐ pain in abdomen · endometrial hyperplasia

It is very uncertain whether summary of findings table ‐ Metformin + levonorgestrel (intrauterine… changes adverse effects during treatment ‐ pain in abdomen compared with levonorgestrel intrauterine system (very low certainty).

1 finding from 1 review

Summary of findings table ‐ Oral classical immunosuppressants (betamethasone) vs oral classical immunosuppressants (azathioprine, methotrexate, prednisolone)

Short‐term hair regrowth ≥ 75% (between 12 and 26 weeks of · adults with alopecia areata

Summary of findings table ‐ Oral classical immunosuppressants… showed no clear difference in short‐term hair regrowth ≥ 75% (between 12 and 26 weeks of compared with oral classical immunosuppressants (azathioprine, methotrexate,… (low certainty).

1 finding from 1 review

Metal-free implant-supported FDPs (zirconia-toughened alumina; In-Ceram Zirconia) vs Metal-free implant-supported FDPs (yttria-stabilized tetragonal zirconia; Denzir)

Periodontal/peri-implant status (secondary outcomes) · Adults (18 years or older) needing an implant-supported fixed dental prosthesis in the posterior region

The review found no eligible studies for this question.

1 finding from 1 review

Metal-free implant-supported FDPs (zirconia-toughened alumina; In-Ceram Zirconia) vs Metal-free implant-supported FDPs (yttria-stabilized tetragonal zirconia; Denzir)

Bridge complications · Adults (18 years or older) needing an implant-supported fixed dental prosthesis in the posterior region

It is very uncertain whether metal-free implant-supported FDPs (zirconia-toughened alumina;… changes bridge complications compared with metal-free implant-supported FDPs (yttria-stabilized tetragonal… (very low certainty).

3 findings from 1 review

Metal-free implant-supported FDPs (zirconia-toughened alumina; In-Ceram Zirconia) vs Metal-free implant-supported FDPs (yttria-stabilized tetragonal zirconia; Denzir)

Bridge failure · Adults (18 years or older) needing an implant-supported fixed dental prosthesis in the posterior region
1 finding from 1 review

Metal-free implant-supported FDPs (zirconia-toughened alumina; In-Ceram Zirconia) vs Metal-free implant-supported FDPs (yttria-stabilized tetragonal zirconia; Denzir)

Aesthetics · Adults (18 years or older) needing an implant-supported fixed dental prosthesis in the posterior region

The review found no eligible studies for this question.

1 finding from 1 review

Metal-free implant-supported single crowns (zirconia veneered with feldspathic ceramic) vs Metal-ceramic implant-supported single crowns

Marginal bone level (first bone to implant contact, FBIC) · Adults (18 years or older) with one missing tooth in the aesthetic zone needing an implant-supported single crown

Metal-free implant-supported single crowns (zirconia veneered with… showed no clear difference in marginal bone level (first bone to implant contact, FBIC) compared with metal-ceramic implant-supported single crowns; GRADE not reported.

3 findings from 1 review

Metal-free implant-supported single crowns (zirconia veneered with feldspathic ceramic) vs Metal-ceramic implant-supported single crowns

Patient satisfaction (measured by patient satisfaction or aesthetic scales) · Adults (18 years or older) with one missing tooth in the aesthetic zone needing an implant-supported single crown

It is very uncertain whether metal-free implant-supported single crowns (zirconia veneered with… changes aesthetic evaluation (patient satisfaction VAS) compared with metal-ceramic implant-supported single crowns (very low certainty).

2 findings from 1 review

Metal-free implant-supported single crowns (zirconia veneered with feldspathic ceramic) vs Metal-ceramic implant-supported single crowns

Aesthetics · Adults (18 years or older) with one missing tooth in the aesthetic zone needing an implant-supported single crown

It is very uncertain whether metal-free implant-supported single crowns (zirconia veneered with… changes aesthetic evaluation (pink and white aesthetic score, PES and WES… compared with metal-ceramic implant-supported single crowns (very low certainty).

1 finding from 1 review

Summary of Findings Table ‐ Electrocoagulation in combination with allopurinol or with dimethyl sulphoxide vs control (vehicle solution of allopurinol by mouth)

All‐cause mortality at last · people with liver metastases

Summary of Findings Table ‐ Electrocoagulation in combination with… may leads to lower all‐cause mortality at last compared with control (vehicle solution of allopurinol by mouth) (low certainty).

1 finding from 1 review

Summary of Findings Table ‐ Electrocoagulation in combination with allopurinol or with dimethyl sulphoxide vs control (vehicle solution of allopurinol by mouth)

Post‐operative deaths · people with liver metastases

It is very uncertain whether summary of Findings Table ‐ Electrocoagulation in combination with… changes post‐operative deaths compared with control (vehicle solution of allopurinol by mouth) (very low certainty).

1 finding from 1 review