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Table 3 Summary of statistical analysis for 200 and 1000 cancer cells after evaluation for Ki-67 proliferation

From: Ki67 proliferation in core biopsies versus surgical samples - a model for neo-adjuvant breast cancer studies

Statistical test

200 cells

1000 cells

 

Mean difference

(95% CI)

p

Mean

difference

(95% CI)

p

t-test,

linear scale

3.9% *

0.1% - 7.8%

0.046

2.2%*

-1.1% - 5.6%

0.19

t-test, linear scale

excluding outlier

4.8% *

1.2% - 8.3%

0.009

3.1%*

0.03% - 6.0%

0.03

t-test multiplicative scale

0.81 **

0.65-1.01

0.063

0.85 **

0.67-1.08

0.18

Wilcoxon***

 

0.03

 

0.06

 

Disparate pairs

(distribution)

p

Disparate pairs

(distribution)

p

Dichotomy

McNemar's test

12

(10+2)****

0.04

8

(4+4)****

1.0

  1. *Core biopsies' average proliferation is higher than surgical samples'
  2. ** Geometric mean of the ratios (surgical specimens/core biopsies)
  3. *** Wilcoxon matched-pairs signed-ranks test
  4. ****Instance of core biopsies as more proliferative + instances of surgical samples as more proliferative