The level of evidence was pooled into two categories: the high level category that included the 1a to 2c categories (mainly randomized clinical trials or cohort studies) and the low level that included the 3 to 5 categories (mainly case-control studies, series of cases, cases and expert opinions).
The output FBA is computed using a parametric, instance-based approach: imprecise training samples in the neighbourhood of x are considered as sources of partial information on the response variable y, and provide pieces of evidence reflecting the values taken by the response y; the pieces of evidences are pooled by using Dempster's rule of combination.
There is pooled evidence that constituents of cigarette smoke cross the placenta, induce pregnancy complications, reduce intrauterine foetal growth and increase the risk of preterm delivery (Table 1) [9,10].
Existing head-to-head evidence cannot be pooled because of significant differences in trial populations and design, and only one review has attempted to make indirect comparisons using placebo-controlled data (Harry and Zakzanis 2005).
The numbers of plants with insects and evidence for damage were pooled for each stand type and the proportions with and without evidence of root herbivory were compared in regards to stand type with Chi-square analysis.
All data were imputed into pre-defined evidence based tables and were pooled using the Review Manager 4.2.1 software for data synthesis.
Because the evidence was insufficient to be pooled we did not conduct any formal statistical tests such as funnel plots or Kendell's test to assess publication bias.
A network meta-analysis refers to networks of trial evidence in which all the available direct and indirect evidence on relative treatment effects are pooled simultaneously in a single coherent analysis.
Saliva from healthy persons with no evidence of seropositivity against hantavirus was pooled and preincubated at different concentrations with 10,000 focus-forming units of ANDV (strain Chile-9717869), HTNV (strain 76-118), or PUUV (strain Kazan E6) for 1 hr (9 ).
Best practice guidelines state that evidence of intervention efficacy should ideally be pooled from the literature in a systematic review or meta-analysis wherever possible to offer a robust and cohesive evidence base.
When data could not be pooled, a 'levels of evidence' synthesis was performed.
