Table 3.

Number and Percentage of Cases Incorrectly Classified by Algorithm as Not Being a Case, by Algorithm and Stage, 1998 Data

	In Situ	Localized	Regional	Metastatic	Unknown
Nattinger	300 (23.6%)	935 (19.0%)	297 (18.4%)	204 (59.6%)	144 (74.6%)
Warren	349 (27.1%)	1,228 (24.4%)	384 (22.7%)	185 (43.0%)	139 (57.0%)
Freeman	528 (40.9%)	1,903 (37.8%)	665 (39.3%)	274 (63.7%)	200 (82.0%)

^*Note: It is impossible to calculate the percentage of noncases that were false negatives by stage, because there is no stage information for the true negatives.