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Table 2 Characteristics of subjects in Haberman data set

From: Machine learning and medicine: book review and commentary

  Class 1 (patient alive 5 years after operation) (n = 204)
(mean ± S.D.)
Class 2 (patient died within 5 years of operation) (n = 102)
(mean ± S.D.)
p
Mean date of operation Aug. 1962 ± 3.2 years Aug. 1962 ± 3.3 years  
Patient age at time of operation (mean ± S.D.) 52.0 ± 11.0 53.7 ± 10.2 0.19
Number of nodes (mean ± S.D.) 2.8 ± 5.9 2.0 ± 9.2 0.36