Table 4.

Positive predictive and negative predictive value for the original Spitz model versus CMBN extension of the model, overall and stratified by smoking status using the model testing (MGH) population

ModelPPV (%)NPV (%)
OverallSpitz model55.258.5
Extended Spitz with BN-MN91.181.3
Never smokersSpitz model50.058.3
Extended Spitz with BN-MN91.785.0
Former smokersSpitz model64.445.1
Extended Spitz with BN-MN94.178.7
Current smokersSpitz model43.976.7
Extended Spitz with BN-MN86.482.2