Overall DC MC p
mean±SD/n(%) mean±SD/n(%) mean±SD/n(%)
Maternal characteristic n=224 n=174 n=50
Age(year), n(%) 0.006
mean±SD 31.97 ±3.75 32.30 ±3.49 30.82 ±4.40
<35 180 (80.4) 137 (78.7) 43 (86.0)
≥35 44 (19.6) 37 (21.3) 7 (14.0)
Maternal weight, kg 59.09 ±8.98 59.52 ±9.38 57.59 ±7.28 0.228
First gestation, n (%) 0.625
Yes 141 (62.9) 111 (63.8) 30 (60.0)
No 83 (37.1) 63 (36.2) 20 (40.0)
Primipara, n (%) 0.081
Yes 199 (88.8) 158 (90.8) 41 (82.0)
No 25 (11.2) 16 (9.2) 9 (18.0)
History of abortion, n (%) 0.404
No 155 (69.2) 118 (67.8) 37 (74.0)
Yes 69 (30.8) 56 (32.2) 13 (26.0)
Pregnancy via ART, n (%) <0.001
No 72 (32.1) 42 (24.1) 30 (60.0)
Yes 152 (67.9) 132 (75.9) 20 (40.0)
Fetal fraction 10.73 ±4.15 10.57 ±4.25 11.30 ±3.78 0.079
Gestational hypertension, n (%) 0.976
No 184 (82.1) 143 (82.2) 41 (82.0)
Yes 40 (17.9) 31 (17.8) 9 (18.0)
Gestational diabetes, n (%) 0.634
No 180 (80.4) 141 (81.0) 39 (78.0)
Yes 44 (19.6) 33 (19.0) 11 (22.0)
Thyroid disease, n (%) 0.977
None 191 (85.3) 147 (84.5) 44 (88.0)
Subclinical hypothyroidism 5 (2.2) 4 (2.3) 1 (2.0)
Hypothyroidism 16 (7.1) 13 (7.5) 3 (6.0)
Subclinical hyperthyroidism 7 (3.1) 6 (3.4) 1 (2.0)
Hyperthyroidism 5 (2.2) 4 (2.3) 1 (2.0)
Fetal characteristic n=448 n=348 n=100
Gestational age at delivery, week 35.87 ±1.99 36.08 ±1.85 35.16 ±2.27 <0.001
Preterm birth, n (%) 0.004
No 200 (44.6) 168 (48.3) 32 (32.0)
Yes 248 (55.4) 180 (51.7) 68 (68.0)
Birth weight, g 2413.55±466.54 2456.14±436.53 2265.35±535.05 0.001
Difference of birth weight 0.12 ±0.11 0.11 ±0.11 0.12 ±0.12 0.331
Birth-weight discordance of 20%, n (%) Birth-weight discordance of 20%, n (%) 0.795
No 380 (84.8) 296 (85.1) 84 (84.0)
Yes 68 (15.2) 52 (14.9) 16 (16.0)
Birth-weight discordance of 25%, n (%) Birth-weight discordance of 25%, n (%) 0.988
No 412 (92.0) 320 (92.0) 92 (92.0)
Yes 36 (8.0) 28 (8.0) 8 (8.0)
sFGR, n (%) 0.706
No 416(92.9) 324 (93.1) 92 (92.0)
Yes 32 (7.1) 24 (6.9) 8 (8.0)