Cochrane Review Group

Dementia and Cognitive Improvement

79 systematic reviews in Dementia and Cognitive Improvement ask 1,049 questions. 22.9% have no studies to answer them, 20.6% rest on very low certainty evidence and 29.5% reach moderate or high certainty.

Reviews

Questions

1,049

current versions

No studies

22.9%

Moderate or high

29.5%

No studies 240 · 22.9%Ungraded 31 · 3%Very low 216 · 20.6%Low 253 · 24.1%Moderate 238 · 22.7%High 71 · 6.8%

Ungraded means an effect was reported without a GRADE rating; it is not a gap. No studies means the review found nothing to answer the question. The six categories are a display order, not a score.

Search questions in Dementia and Cognitive Improvement

Thinnest evidence

All no studies and very low questions

Question	Effect	Evidence	Status / GRADE
Transcranial direct current stimulation (tDCS) vs sham tDCS Word retrieval · adults with primary progressive aphasia (PPA) Non‐pharmacological interventions for improving language and communication in people with primary… (2024) · Cochrane	no estimate extracted	NR	No studies
Active tDCS plus semantic and phonological word‐retrieval training vs sham tDCS plus semantic and phonological word‐retrieval training Adverse events · adults with primary progressive aphasia (PPA) Non‐pharmacological interventions for improving language and communication in people with primary… (2024) · Cochrane	no estimate extracted	2 studies · 37 participants	Very low
Active tDCS plus phonological word‐retrieval training vs sham tDCS plus phonological word‐retrieval training Word retrieval · adults with primary progressive aphasia (PPA) Non‐pharmacological interventions for improving language and communication in people with primary… (2024) · Cochrane	no estimate extracted	1 study · 6 participants	Very low
Active tDCS plus phonological word‐retrieval training vs sham tDCS plus phonological word‐retrieval training Overall language abilities · adults with primary progressive aphasia (PPA) Non‐pharmacological interventions for improving language and communication in people with primary… (2024) · Cochrane	no estimate extracted	NR	No studies
Active tDCS plus phonological word‐retrieval training vs sham tDCS plus phonological word‐retrieval training Overall cognitive assessment · adults with primary progressive aphasia (PPA) Non‐pharmacological interventions for improving language and communication in people with primary… (2024) · Cochrane	no estimate extracted	NR	No studies
Active tDCS plus phonological word‐retrieval training vs sham tDCS plus phonological word‐retrieval training Quality of life · adults with primary progressive aphasia (PPA) Non‐pharmacological interventions for improving language and communication in people with primary… (2024) · Cochrane	no estimate extracted	NR	No studies
Active tDCS plus phonological word‐retrieval training vs sham tDCS plus phonological word‐retrieval training Adverse events · adults with primary progressive aphasia (PPA) Non‐pharmacological interventions for improving language and communication in people with primary… (2024) · Cochrane	no estimate extracted	1 study · 6 participants	Very low
Active tDCS plus semantic word‐retrieval training vs sham tDCS plus semantic word‐retrieval training Word retrieval · adults with primary progressive aphasia (PPA) Non‐pharmacological interventions for improving language and communication in people with primary… (2024) · Cochrane	no estimate extracted	1 study · 3 participants	Very low
Active tDCS plus semantic word‐retrieval training vs sham tDCS plus semantic word‐retrieval training Overall language abilities · adults with primary progressive aphasia (PPA) Non‐pharmacological interventions for improving language and communication in people with primary… (2024) · Cochrane	no estimate extracted	NR	No studies
Active tDCS plus semantic word‐retrieval training vs sham tDCS plus semantic word‐retrieval training Overall cognitive assessment · adults with primary progressive aphasia (PPA) Non‐pharmacological interventions for improving language and communication in people with primary… (2024) · Cochrane	no estimate extracted	NR	No studies
Active tDCS plus semantic word‐retrieval training vs sham tDCS plus semantic word‐retrieval training Quality of life · adults with primary progressive aphasia (PPA) Non‐pharmacological interventions for improving language and communication in people with primary… (2024) · Cochrane	no estimate extracted	NR	No studies
Transcranial direct current stimulation (tDCS) vs sham tDCS Overall language abilities · adults with primary progressive aphasia (PPA) Non‐pharmacological interventions for improving language and communication in people with primary… (2024) · Cochrane	no estimate extracted	1 study · 15 participants	Very low