Table 2 Mean dimension measurements and slopes

From: The biomechanical evolution of the uterus and cervix and fetal growth in human pregnancy

 

Mean ± SD (mm)

Slope (mm/week)

 

L1

M2

L2

M3

Overall

L1-M2

M2-L2

L2-M3

IS-UD

81.7 ± 17.8

151.5 ± 16.3

201.8 ± 21.6

269.5 ± 28.3

8.2***

10.5***

7.9***

6.3***

AP-UD

49.3 ± 14.2

61.5 ± 9.5

73.8 ± 11.7

98.3 ± 23.1

2.1***

1.7***

2.4***

2.3***

LR-UD

85.8 ± 12.2

131.6 ± 16.7

184.3 ± 21.3

224.8 ± 21.6

6.3***

6.7***

8.7***

4.1***

LUS-UT

5.0 ± 1.5

4.9 ± 2.0

4.7 ± 1.8

3.6 ± 1.3

−0.1***

−0.1

0.0

−0.1**

CL

41.7 ± 5.7

41.4 ± 5.3

42.0 ± 4.8

37.1 ± 6.4

−0.2***

0.0

−0.1

−0.5***

aCS (mbar)

128 ± 51

91 ± 36

74 ± 39

61 ± 30

−3***

−5***

−2

−1

  1. Mean and standard deviation (SD) for 2D ultrasonic and cervical stiffness measurements across all participants and gestation ages. Visits occurred in the late first (L1), middle second (M2), late second (L2), and middle third (M3) trimesters. Overall (L1-M3) and between-visit slopes for 2D ultrasonic measurements with participant correlation. Asterisks indicate significance level: P > 0.05 (), P = 0.01–0.05 (*), P = 0.001–0.01 (**), P < 0.001 (***).
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