Correlation between the results of CSFTT and outcome after shunting
| Response of CSFTT | SR+ | 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). | |||
| CSFTT+ | 9 | 0 | 9 |
| CSFTT− | 2 | 12 | 38 |
| Total | 35 | 12 | 47 |