Centres or sites were randomised by a central randomisation procedure to either a benchmarking group or a control group.
Investigators were randomized by a centralized randomization procedure (What Health, Brussels, Belgium) to either a benchmarking group or a control group.
However, in both the case of antibodies and symptoms, patients provide their own controls and the population-based material are merely intended to provide a benchmark control group, since IVF patients could represent a selected group.
Our benchmark group reports the highest reservation wage, still with a high participation ratio to the labor market.
This information shows also that Moroccans perform much better in their own circle as opposed to the broader benchmark group.
d Reasons for benchmark group exclusions; 9 studies of defined patient populations (pediatric, cardio-thoracic surgery, liver transplantation, ARDS), 12 studies with <50% of patients receiving MV >24 hours, 6 studies published prior to 1983, or 6 intervention studies.
A summary VAP-IP derived from benchmark groups originating from European centres and non-European centres were each within two percentage points of the benchmark (Table 2).
A VAP-IP benchmark derived from 45 observational (benchmark) groups of mechanically ventilated patients is 22.1%.
The VAP-IP benchmark derived from all 45 observational (benchmark) groups is 22.1% with a 95% confidence interval of 19.0% to 25.5%, and with a 95% prediction interval of 8.6% to 47.3%.
Of the 17 studies identified in these two systematic reviews, only two studies, one from each systematic review, had a control group with a VAP-IP above 47.3%, the upper 95% limit of the prediction range derived from the benchmark groups here, whereas three had an intervention group VAP-IP below the lower 95% limit of the prediction range derived from the benchmark groups.
