Table 2

Correlation between the results of CSFTT and outcome after shunting

Response of CSFTTSR+SR−Total
CSFTT, CSF tap test; CSFTT+, obvious improvement after CSFTT; CSFTT−, questionable or no improvement after CSFTT; SR+, improvement after shunting; SR−, no improvement after shunting; sensitivity of CSFTT, 26% (95% CI 12–43); specificity of CSF-TT, 100% (95% CI 74–100). Predictive value of a positive CSFTT, 100% (95% CI 66–100); predictive value of a negative CSFTT, 32% (95% CI 17–49).