Table 1 The average percentage of the abnormal cells in the placental layers for CPM types I, II, and III

From: Outcomes in pregnancies with a confined placental mosaicism and implications for prenatal screening using cell-free DNA

CPM types

Overall

RAT (excluding T16)

T16 only

Tetraploidy

Cases

% Abnormal cells mean (min–max)

Cases

% Abnormal cells mean (min–max)

Cases

% Abnormal cells mean (min–max)

#

%

#

%

Dir

LTC

#

%

Dir

LTC

#

%

Dir

LTC

I

55

44.4

45

47.9

30.9 (5.5–100)

 

1

8.3

40.0a

 

9

50.0

83.7 (50–100)

 

II

49

39.5

40

42.6

 

33.5 (5.4–100)

5

41.7

 

38.4 (9.1–75)

4

22.2

 

89.5 (75–100)

III

20

16.1

9

9.6

64.1 (3.9–100)

50.5 (7.1–100)

6

50.0

95.0 (100–100)

83.1 (100–100)

5

27.8

71.8 (40–100)

24.5 (7–50)

Total

124

 

94

   

12

   

18

   
  1. CPM confined placental mosaicism, Dir direct preparation, LTC long-term culture, RAT rare autosomal trisomy, T16 trisomy 16.
  2. aOne case.