## Table 2 |
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Statistical comparisons of five endometrial lesions |
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Parameter a vs. Parameter b |
Positives (Parameter a) |
Positives (Parameter b) |
χ^{2}value* |
p value* |

Simple hyperplasia vs. atypical complex hyperplasia | 8/27(30%) | 20/41(49%) | 2.465 | 0.116 |

Simple hyperplasia vs. endometrioid carcinoma | 8/27(30%) | 54/103(52%) | 4.457 | 0.035 |

Simple hyperplasia vs. endometrial serous carcinoma | 8/27(30%) | 8/21(38%) | 0.381 | 0.537 |

Simple hyperplasia vs. clear cell carcinoma | 8/27(30%) | 6/9(67%) | 3.50*** | 0.111** |

Atypical complex hyperplasia vs. endometrioid carcinoma | 20/41(49%) | 54/103(52%) | 0.156 | 0.693 |

Atypical complex hyperplasia vs. endometrial serous carcinoma | 20/41(49%) | 8/21(38%) | 0.640 | 0.424 |

Atypical complex hyperplasia vs. clear cell carcinoma | 20/41(49%) | 6/9(67%) | 4.32*** | 0.467** |

Endometrioid carcinoma vs. endometrial serous carcinoma | 54/103(52%) | 8/21(38%) | 1.433 | 0.231 |

Endometrioid carcinoma vs. clear cell carcinoma | 54/103(52%) | 6/9(67%) | 4.18*** | 0.500** |

Endometrial serous carcinoma vs. clear cell carcinoma | 8/21(38%) | 6/9(67%) | 4.20*** | 0.236 |

*: We took partitioning Chi-squares when individual comparisons were performed, in
order to avoid amplifying the probability to commit type I mistake, *p* value should be reset as *p’* = 1-m√(1-p)*,* “m” represented group numbers. In this case, *p’ =* 1-5√(1-0.05) = 0.005, so we considered *p* < 0.005 as statistically significant.

**: When expected cell value was 5 or less, we used Fisher’s exact test.

***: The expected cell values were 3.50, 4.32, 4.18 and 4.20 for simple hyperplasia vs. clear cell carcinoma, atypical complex hyperplasia vs. clear cell carcinoma, endometrioid carcinoma vs. clear cell carcinoma and endometrial serous carcinoma vs. clear cell carcinoma, respectively.

Liang * et al.*

Liang * et al.* *Diagnostic Pathology* 2013 **8**:138 doi:10.1186/1746-1596-8-138