Figure 1.

Odds ratios of the incidence of nosocomial pneumonia for the individual randomized controlled trials comparing chlorhexidine and controls for the management of mechanically ventilated patients and the pooled analysis. Vertical line, 'no difference' point between the two regimens; square, odds ratio (size of each square denotes the proportion of information given by each trial); diamond, pooled odds ratio for all randomized controlled trials; horizontal lines, 95% confidence intervals.