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Table 2 Estimated (weighted) age at first excisional treatment by length of tissue removed among women in the cohort study

From: How many preterm births in England are due to excision of the cervical transformation zone? Nested case control study

 

<10 mm

10–14 mm

15–19 mm

20 + mm

Total

 

N

%

N

%

N

%

N

%

 

<20

42.1

36.1

64.2

54.9

9.5

8.2

1.0

0.9

116.9

20–24

836.9

52.5

535.7

33.6

154.5

9.7

68.2

4.3

1595.3

25–29

957.8

42.0

974.4

42.8

238.3

10.5

108.4

4.8

2278.8

30–34

510.3

49.8

424.0

41.4

62.7

6.1

27.1

2.6

1024.0

35–39

140.5

58.5

56.7

23.6

32.6

13.6

10.5

4.4

240.3

Total

2487.6

47.3

2054.9

39.1

497.6

9.5

215.2

4.1

5255.3