Table 3

Performance of the PredAHT-2 tool at three probability cut-offs

Applying PredAHT (indeterminate excluded)20% cut-off50% cut-off80% cut-off
OutcomeOutcomeOutcome
AHTnAHTAHTnAHTAHTnAHT
Higher risk of AHT2230206154
Lower risk of AHT5157391241
Value95% CIValue95% CIValue95% CI
Sensitivity81%62% to 94%74%54% to 89%56%35% to 75%
Specificity33%20% to 49%87%73% to 95%91%79% to 98%
Positive predictive value42%29% to 57%77%56% to 91%79%54% to 94%
Negative predictive value75%51% to 91%85%71% to 94%77%64% to 88%
LR +1.220.93 to 1.615.562.55 to 12.16.252.31 to 16.9
LR −0.560.23 to 1.360.300.16 to 0.570.490.32 to 0.75
  • AHT, abusive head trauma; LR, likelihood ratio; nAHT, no abusive head trauma; PredAHT, Predicting Abusive Head Trauma.