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Annals of Intensive Care
Fig. 3 | Annals of Intensive Care

Fig. 3

From: Trends in ICU mortality and underlying risk over three decades among mechanically ventilated patients. A group level analysis of cohorts from infection prevention studies

Fig. 3

Scatter plot and linear regression of group-mean APACHE II score versus year of study publication for observational groups and control and interventions groups from studies of non-decontamination and decontamination interventions. The linear regression line of APACHE II score versus publication year, derived using the observational groups, increases by + 1.8 points per decade; 95% confidence interval + 0.51 to + 3.2; p = 0.007) and serves as a benchmark for all plots [symbols; filled triangle = non-concurrent control groups; filled square = groups receiving PPAP; open circle = all other groups; NCC groups appear as observational groups].The same plot showing each individual group traceable to the original study is shown in Additional file 1: Fig. S4

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