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## Figure 2.
Box plots illustrating Wald chi-square statistics from 500 bootstrap samples. Testing associations of (A) B7-H3, (B) survivin, (C) Ki-67, (D) CAIX, (E) IMP3,
and (F) B7-H1 expression with RCC-specific death using 1 and up to 10 cores. The lower,
middle, and upper horizontal lines that comprise the boxes denote the 25^{th }percentile, median, and 75^{th }percentile of the distribution of test statistics from the 500 bootstrap samples.
Using a significance level of 0.05, the critical value for a 1 degree-of-freedom chi-square
test statistic is approximately 3.8. B7-H1 was modeled as dichotomous (positive versus
negative), whereas B7-H3, survivin, Ki-67, CAIX, and IMP3 were modeled as continuous.
Eckel-Passow |