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Table 1 Comparison of clinical features: between PTB and Term delivery, between PTB + Miscarriage and Term delivery

From: Risk factors for spontaneous miscarriage above 12 weeks or premature delivery in patients undergoing cervical polypectomy during pregnancy

Clinical feature

PTB

PTB + Miscarriage

Term delivery

(N = 15)

(N = 20)

(N = 53)

Age

33.2 ± 5.3

32.5 ± 5.2

34.3 ± 3.4

Nulliparity (%)

40.0

45.0

50.9

Smoking (%)

6.6

5.0

1.8

Previous second trimester loss (%)

26.6

35.0**

13.2

History of full-term delivery (%)

50.0

40.0

57.1

Other maternal diseases (%)

6.6

10.0

30.1

Uterine anomalies (%)

6.6

15.0

0.8

Use of vaginal progesterone (%)

0

0

0

Infertility treatment (%)

13.3

10.0

18.8

History of PTB (at < 34 weeks) (%)

40.0

33.3

13.8

Bleeding before polypectomy (%)

73.3

75.0**

49.0

Nugent score (points)

0 (0–8)

0 (0–8)

0 (0–10)

GA at polypectomy (weeks)

9 (5–25)

9 (5–25)

11 (5–29)

Polypectomy by twisting (%)

80.0

70.0**

90.5

Polyp width (mm)

11.1 ± 8.8*

12.5 ± 8.5**

6.8 ± 3.9

Decidual polyps (%)

93.3*

95.0**

62.2

Leukocytes in polyps (/HPF)

275 ± 128

280 ± 147

314 ± 201

Prelabour rupture of membranes (%)

26.6

25.0

11.3

h-CAM ≥ stage 2 (%)

72.7*

50.0

20.0

Funisitis (%)

45.4

31.2

24.0

Offspring GA at birth (weeks)

29.8 ± 4.8*

25.8 ± 8.3**

38.8 ± 1.2

Offspring birth weight (g)

1540 ± 774*

1365 ± 875**

3027 ± 392

  1. Data indicate the mean ± standard deviation or median (range), PTB preterm birth, GA gestational age, HPF high power field, h-CAM histological chorioamnionitis, N/A not available, *: Significant difference between PTB and Term delivery, p <  0.05, **: Significant difference between PTB + Miscarriage and Term delivery, p <  0.05