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Table 1 Age distributions of breast tissue data sets in the study

From: Estimating breast tissue-specific DNA methylation age using next-generation sequencing data

Tissue type

N

Mean age (years)

SD (years)

Normal

459

47.7

13.4

 Training set

368

47.7

13.5

 Testing set

91

47.7

12.9

Adjacent normal*

45

53.1

12.1

Tumor*

107

55.3

13.6

 HER2+

21

56.8

16.9

 ER+ or PR+/HER2-

42

54.4

11.7

 ER-/PR-/HER2-

15

53.9

12.4

  1. HER2 epidermal growth factor receptor 2, ER estrogen receptor, PR progesterone receptor
  2. *Age distribution is significantly different from the normal breast tissue testing data set (p < 0.05)