Table 3

Correlation between the results of ELD and outcome after shunting

Outcome after ELDSR+SR−Total
ELD, External lumbar drainage; ELD+, improvement after ELD; ELD−, no improvement after ELD; SR+, improved after shunting; SR−, not improved after shunting; sensitivity, 50% (95% CI 31–69); specificity, 80% (95% CI 44–97); positive predictive value of ELD, 87% (95% CI 62–98); negative predictive value of ELD, 36% (95% CI 17–59).