Table 2.
Maternal and offspring characteristics at baseline and key information of REPRESENT database
| Variables | Total number (No.) | Median (QL–QU)a | Missing values (No., %) |
|---|---|---|---|
| Number of registrations per year | 766 124 | 55 765 (35 020–96 973) | 70 (0.01)e |
| Number of deliveries per year | 758 147 | 73 904 (52 428–83 671) | 150 (0.02)f |
| Maternal age (years) | 764 069 | 27 (25–30) | 2125 (0.27)e |
| Gestational week at registration (weeks) | 748 851 | 13 (10–18) | 17343 (2.26)e |
| Gestational week at delivery (weeks) | 765 021 | 39.3 (38.4–40.1)d | 725 (0.21)g |
| Gravidity (times)b | 754 571 | 2 (1–3) | 11 623 (1.52)e |
| Maternal height (m) | 765 307 | 1.59 (1.56–1.62) | 2416 (0.32)e |
| Pre-pregnancy body mass index (kg/m2) | 702 512 | 20.29 (18.75–22.22) | 64 923 (8.47)e |
| Birthweight (g) | 761 962 | 3230 (2970–3500） | 3784 (0.50)g |
| Length (cm) | 765 515 | 50 (49–50) | 231 (0.03)g |
| Education level (years) | 715 680 | N/A | 50 228 (6.56)e |
| Illiterate and semi-illiterate | 1718 (0.24)d | ||
| 1–6 | 17 887 (2.50)d | ||
| 7–9 | 211 201 (29.50)d | ||
| 10–12 | 157 612 (22.01)d | ||
| >12 | 320 562 (44.77)d | ||
| Unclear | 6986 (0.98)d | ||
| Parity (n, %)c | 709 817 | 0 (0–1） | 56 377 (7.36)e |
| Nullipara | 381 442 (53.74)d | ||
| Multipara | 328 375 (46.29)d | ||
| Current smoking | 765 909 | N/A | 285 (0.04)e |
| Yes | 2424 (0.32)d | ||
| No | 763 485 (99.68)d | ||
| Current alcohol consumption | 765 909 | N/A | 285 (0.04)e |
| Yes | 474 (0.06)d | ||
| No | 765 435 (99.94)d | ||
| Mode of delivery | 756 713 | N/A | 1524 (0.20)f |
| Vaginal delivery | 510 891 (67.51)d | ||
| Caesarean section | 245 822 (32.49)d | ||
| Multiple gestations | 765 746 | N/A | 0 (0.00)f |
| Singleton | 745 915 (97.41)d | ||
| Multiple gestations | 19 831 (2.59)d |
QL, lower quartile; Qu, upper quartile; N/A, not applicable.
Gravidity refers to the number of pregnancies, including current and past pregnancies, no matter whether the pregnancies were interrupted or resulted in a live birth.
Parity refers to the number of deliveries of a fetus at or after 24th gestational weeks, regardless of live birth or stillbirth. Nullipara indicates that a woman has no birth history, and multipara means a woman had more than one birth.
No. (%).
The number of pregnancies in antenatal care (766 194) is the denominator.
The number of pregnancies in maternal delivery care (758 237) is the denominator.
The number of newborns in neonatal delivery care (765 746) is the denominator.