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Table 1 Patients’ characteristics (n = 252)

From: Success rate to complete optimal 20 + 2 ISUOG planes for foetal ultrasonographic structural screening during early second trimester pregnancy in Thailand

  GA < 20 weeks
(n = 126)
GA ≥ 20 weeks
(n = 126)
Overall
(252)
P-value
Age (years)     0.892
Median (interquartile range) 29 (23–33) 28.5 (23–32.5) 29 (23–33)
Race, n (%)     0.593
Thai 106 (49.3%) 109 (50.7%) 215
Other 20 (54.1%) 17 (45.9%) 37
BMI (kg/m2)     0.656
Median (interquartile range) 23.8 (21.4–26.7) 23.7 (20.8–27.1) 23.8 (21–26.9)
Gravid, n (%)     0.240
Nulligravida (G = 1) 51 (54.8%) 42 (45.2%) 93
Multigravida (G ≥ 2) 75 (47.2%) 84 (52.8%) 159
Parity, n (%)     0.253
Nulliparous (P = 0) 60 (54.1%) 51 (45.9%) 111
Multiparous (P ≥ 1) 66 (46.8%) 75 (53.2%) 141
History of abdominal surgery, n (%)     0.357
Presence 24 (44.4%) 30 (55.6%) 54
Absence 102 (51.5%) 96 (48.5%) 198
Type of previous abdominal scar incision, n (%)     0.694
Midline 5 (50%) 5 (50%) 10
Transverse 16 (41%) 23 (59%) 39
Laparoscopic 1 (100%) 0 1
Other 2 (50%) 2 (50%) 4
Abdominal wall thickness (cm)     0.889
Median (interquartile range)  1.7 (1.3-2.2)  1.7 (1.3-2.1)  1.7 (1.3-2.1)
Deep vertical pocket (cm)      0.135
Mean ± SD 3.9 ± 0.9 4.1 ± 1.0 4.0 ± 1.0
Placental location n (%)     0.130
Anterior 72 (54.5%) 60 (45.5%) 132
Posterior 54 (45.0%) 66 (55.0%) 120
Myoma uteri n (%)     0.175
Presence 1 (20%) 4 (80%) 5
Absence 125 (50.6%) 122 (49.4%) 247