Table 2

Association between tumor histologic grade and intrinsic subtype in the 315-sample combined test set.

Intrinsic Subtype

Two-way contingency table

LumA

(#of pts.)

LumB

(#of pts.)

IFN

(#of pts.)

HER2+/ER-

(#of pts.)

Basal-like

(#of pts.)

Grade

1 (well)

29

2

1

0

1

2 (intermediate)

45

26

8

6

16

3 (poor)

15

32

16

21

67

Statistics for two-way contingency table analysis

p-value† <0.0001

Cramer's V†† 0.42

†p-value calculated from Chi-square test on contingency table. ††Cramer's V statistic (value can range from 0 to 1) measures the strength of association between the two variables analyzed in the contingency table, with 1 indicating perfect association and 0 indicating no association.

Hu et al. BMC Genomics 2006 7:96   doi:10.1186/1471-2164-7-96