Table 2.
Numbers of patients, sensitivity and specificity for each of variables examined.
| Variables | TP | TN | FP | FN | Sensitivity (%) | Specificity (%) | |
|---|---|---|---|---|---|---|---|
| 1 | GS-Gait-change | 41 | 16 | 4 | 39 | 51.3 | 80.0 |
| 2 | GS-Cogn-change | 20 | 17 | 3 | 60 | 25.0 | 85.0 |
| 3 | GS-Urin-change | 30 | 17 | 3 | 50 | 37.5 | 85.0 |
| 4 | GS-Total-change | 57 | 13 | 7 | 23 | 71.3 | 65.0 |
| 5 | TUG ≥ 10% (sec)1 | 26 | 14 | 5 | 50 | 34.2 | 73.6 |
| 6 | MMSE ≥ 3 | 51 | 6 | 14 | 29 | 63.8 | 30.0 |
| 7 | Tap-any | 74 | 4 | 16 | 6 | 92.5 | 20.0 |
| 8 | GS-Total-change, CSFP ≥ 15 cmH2O2 | 66 | 13 | 7 | 14 | 82.5 | 65.0 |
Abbreviations: TP: true positives, TN: true negatives, FP: false positives, FN: false negatives (), GS-Gait-change: grading scale gait change 1-2 days after CSF tap, GS-Cogn-change: grading scale cognition change 7 days after tap, GS-Urin-change: grading scale urinary change 7 days after tap, GS-total change: sum of change for all three grading scales, TUG ≥ 10%: ≥ 10% improvement in timed-up -and-go test, MMSE ≥ 3: improvement of 3 or more points on the Mini-Mental State Examination score 7 days after tap, Tap-any: Calculated from improvement in any of the iNPHGS, TUG or MMSE. 1: N = 95 patients, 2: calculated from decision tree analysis.