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Transcerebellar diameter versus biparietal diameter for the measurement of gestational age in third trimester


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Fig. 1

2D gray-scale ultrasound of a pregnant woman at 37 weeks GA showing TCD measuring 52.5 mm corresponding to 37 weeks GA
2D gray-scale ultrasound of a pregnant woman at 37 weeks GA showing TCD measuring 52.5 mm corresponding to 37 weeks GA

Fig. 2

2D gray-scale ultrasound of a pregnant woman at 37 weeks GA showing BPD measuring 89.9 mm corresponding to 36 weeks + 2 days GA
2D gray-scale ultrasound of a pregnant woman at 37 weeks GA showing BPD measuring 89.9 mm corresponding to 36 weeks + 2 days GA

Fig. 3

Plot showing a strong positive correlation between GA measured by LMP and GA measured by TCD
Plot showing a strong positive correlation between GA measured by LMP and GA measured by TCD

Fig. 4

Plot showing a strong positive correlation between GA measured by LMP and GA measured by BPD
Plot showing a strong positive correlation between GA measured by LMP and GA measured by BPD

Intra-class correlation coefficient for agreement between GA measured by TCD and GA measured by LMP

Intra-class correlation (ICC)95% confidence intervalF test with true value 0
Lower boundUpper boundValueSig
Single measures0.9780.9730.98391.849<0.001 HS
Average measures0.9890.9860.99191.849<0.001 HS

Demographic characteristics of study participants

Min.Max.MeanSD
Age (years)18.0034.0024.003.85
BMI (kg/m2)21.0034.0027.513.63
AFI (cm)9.0017.0012.342.16
N%
Parity112441.5%
29732.4%
35618.7%
4227.4%
Total299100.0%

Comparison between TCD and BPD regarding correct assessment of GA (accuracy of GA assessment)

N%P value*
Correct assessment of GA by TCDYes28093.6%<0.001 HS
No196.4%
Correct assessment of GA by BPDYes23979.9%
No6020.1%

Intra-class correlation coefficient for agreement between GA measured by BPD and GA measured by LMP

Intra-class correlation (ICC)95% confidence intervalF test with true value 0
Lower boundUpper boundValueSig
Single measures0.8700.8390.89514.378<0.001 HS
Average measures0.9300.9130.94514.378<0.001 HS

Accuracy of TCD for GA estimation in the 3rd trimester compared to the results of other studies

StudyPearson correlationP-value
This study0.98<0.001
Chavez et al.(15)0.950.001
Reddy et al.(12)0.9820.0004
George et al.(14)0.995<0.001
Bavini et al.(11)0.971<0.0001
eISSN:
2451-070X
Language:
English
Publication timeframe:
4 times per year
Journal Subjects:
Medicine, Basic Medical Science, other