Summary of NTIs for the van de Vijver and the BBCP data set. A NTI and p-value is computed for each clinical parameter. For both data sets, the highest NTI is obtained for the estrogen receptor. The number of asterisks indicates the level of significance of the correlation. One asterisk means that the rejection of H
0 (no correlation) is statistically significant at the 5% level, two asterisks at the 1% level, and three asterisks at the 0.1% level. No asterisk means that H0 cannot be rejected.