The quality of the evidence used in reaching these conclusions was low and the review does not, therefore, offer clear guidance to clinicians and patients on best practice and matching interventions to particular patient characteristics.
The quality of the evidence was typically of low or unclear risk of bias(94 out of 113 trials, 83%) and the precision of summary estimates for treatment effect varied considerably.
However, the quality of the evidence was generally low or very low, partly due to the trials being small and without sufficient numbers of women participating.
Quality of the evidenceThe quality of the evidence is low or very low mainly due to poorly conducted trials, for example with unclear randomisation method and blinding.
All studies contributing to our analyses were of direct relevance to our research question, but we rated the quality of the evidence for all outcomes as low to very low.
Quality of the evidence We judged the quality of the evidence on rate of progression to AMD to be high, and the quality of the evidence for other outcomes to be moderate because the estimates were imprecise.
The quality of evidence for side effects ranged from very low to moderate, and was downgraded because of issues with study design, dissimilar results across studies, or not enough data.
The quality of evidence for all outcomes was very low, so we can draw no conclusions about whether light therapy is effective in preventing winter depression.
Most of our outcomes of interest were graded as moderate-quality evidence according to the GRADE criteria and the risk of bias in the majority of included studies was mostly unclear.
There was low- quality evidence on the number of people showing a significant clinical improvement and the result was imprecise so we were unable to be sure of any effect on this measure.
There was very substantial heterogeneity in this analysis(I(2) value 80%), most of which we were unable to explain, and we rated the quality of this evidence as very low.
We currently don't know if micronutrient supplements have any effect on tuberculosis treatment outcomes(very low quality evidence), but they may have no effect on weight gain(low quality evidence).
However, again we observed considerable unexplained heterogeneity(I(2) value 77%) in this meta-analysis, and we rated the quality of this evidence as very low.
Although some treatments look promising(including rectal sucralfate, adding metronidazole to an anti-inflammatory regimen, and hyperbaric oxygen therapy), the quality of evidence was low to very low.
There was very substantial heterogeneity in this analysis(I² value 80%), most of which we were unable to explain, and we rated the quality of this evidence as very low.
Three trials reported on the incidence of complete closure(isoxsuprine, arginine butyrate, RGD peptide matrix; ranging between low and very low quality of evidence).
For prefrontal TMS compared to sham TMS, global state was measured on three different scales, all of which presented equivocal results(very low quality evidence).
We currently don't know if providing free food to tuberculosis patients, as hot meals or ration parcels, reduces death or improves cure(very low quality evidence).
There was no difference between groups in time spent in hospital, muscle strength or death rates. Quality of the evidenceOverall there was low-quality evidence from these studies.
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