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Table 2 Risk of bias scoring

From: Variables associated with unplanned general adult ICU admission in hospitalised patients: protocol for a systematic review

Participant selection Score
Cohort studies
 Selected cohort is very representative of the general hospitalised population 2
 Selected cohort is somewhat representative of the general hospitalised population 1
 Cohort is not representative of the general hospital population or the selection of the group was not described 0
Case-control studies
 Cases and controls drawn from the same population and population is very representative of the general hospitalised population 2
 Cases and controls drawn from the same population and population is somewhat representative of the general hospitalised population 1
 Cases and controls drawn from different sources or the selection of groups was not described 0
Comparability of groups
 No differences between the groups explicitly reported unless it was one of these variables that was under investigation, or such differences were adjusted for 2
 Differences between groups were not recorded 1
 Groups differed 0
Size
 >100 participants in each group 2
 <100 participants in each group 1
 Adjustment for confounding 1
 Adjustment made for confounding factors in data analysis 1
 No adjustment for cofounders 0