Table 2. Optimized Risk Score for Seizure Probabilitya.
| Variable | Total Score | ||||||
|---|---|---|---|---|---|---|---|
| 0 | 1 | 2 | 3 | 4 | 5 | >6 | |
| Probable risk of Sz, %b | 5 | 12 | 27 | 50 | 73 | 88 | >95 |
| Actual prevalence of Sz, % (95% CI)c | 3 (2-3) | 12 (10-13) | 34 (31-37) | 52 (46-57) | 71 (63-78) | 84 (71-99) | 92 (77-100) |
a
Scoring for each risk factor was 2 points for brief rhythmic discharge and 1 point each for lateralized periodic discharges/bilateral independent periodic discharges/lateralized rhythmic delta activity; plus features; prior seizure; frequency greater than 2 Hz; and discharges. Note, no patients had 7 points in the cohort (all possible risk factors); hence, its noninclusion.
b
Probability of seizure presented as the mean; probable risk is the probability of seizure based on RiskSLIM.
c
The numbers in parentheses are 95% CIs obtained using bootstrap resampling.