Table 3. Maternal Baseline and Pregnancy Characteristics in 2017-2019 and 2020.
| Characteristic | Births, No. (%) | P value | ||
|---|---|---|---|---|
| 2017-2019 | 2020 | Total | ||
| All births | ||||
| No. | 140 346 | 44 481 | 184 827 | NA |
| Routine medical check-ups during pregnancy | ||||
| Median (IQR) | 11 (10-13) | 11 (9-13) | 11 (10-13) | .15a |
| Missing, No. | 35 496 | 10 931 | 46 427 | NA |
| Maternal age, median (IQR), y | 31 (28-35) | 32 (28-35) | 31 (28-35) | <.001a |
| GA at admission | ||||
| Median (IQR), wk | 39 4/7 (38 3/7 to 40 2/7) | 39 4/7 (38 4/7 to 40 3/7) | 39 4/7 (38 3/7 to 40 2/7) | <.001a |
| Missing, No. | 686 | 215 | 901 | NA |
| Admission to birth interval, median (IQR), d | 0 (0-1) | 0 (0-1) | 0 (0-1) | .28a |
| Antenatal steroids | 6399 (4.56) | 1481 (3.33) | 7880 (4.26) | <.001b |
| Mode of delivery | ||||
| Spontaneous | 93 711 (66.77) | 29 736 (66.85) | 123 447 (66.79) | .003b |
| Cesarean | 46 635 (33.23) | 14 745 (33.15) | 61 380 (33.21) | .76b |
| Emergency cesarean deliveryc | 2071 (4.44) | 708 (4.80) | 2779 (4.53) | .07b |
| Stillbirth | 548 (0.39) | 171 (0.38) | 719 (0.39) | .86b |
| Full term infants (≥37 wk) | ||||
| No. | 128 262 | 40 943 | 169 205 | NA |
| Routine medical check-ups during pregnancy | ||||
| Median (IQR) | 11 (10-13) | 11 (10-13) | 11 (10-13) | .02a |
| Missing, No. | 32 725 | 10 217 | 42 942 | NA |
| Maternal age, median (IQR), y | 31 (28-35) | 32 (28-35) | 31 (28-35) | <.001a |
| GA at admission, median (IQR), wk | 39 5/7 (38 5/7 to 40 3/7) | 39 5/7 (38 6/7-40 3/7) | 39 5/7 (38 5/7 to 40 3/7) | .01a |
| Admission to birth interval, , median (IQR), d | 0 (0-1) | 0 (0-1) | 0 (0-1) | .85a |
| Antenatal steroids | 2024 (1.58) | 330 (0.81) | 2354 (1.39) | <.001b |
| Mode of delivery | ||||
| Spontaneous | 88 419 (68.94) | 28 164 (68.79) | 116 583 (68.9) | <.001b |
| Cesarean | 39 843 (31.06) | 12 779 (31.21) | 52 622 (31.10) | .57b |
| Emergency cesarean deliveryc | 1560 (3.92) | 540 (4.23) | 2100 (3.99) | .12b |
| Stillbirth | 136 (0.11) | 53 (0.13) | 189 (0.11) | .22b |
| Late preterm infants (32-36 wk) | ||||
| No. | 9334 | 2751 | 12 085 | NA |
| Routine medical check-ups during pregnancy | ||||
| Median (IQR) | 9 (8-11) | 9 (8-11) | 9 (8-11) | .49a |
| Missing, No. | 1751 | 439 | 2190 | NA |
| Maternal age, median (IQR), y | 32 (29-36) | 32 (29-36) | 32 (29-36) | .65a |
| GA at admission, median (IQR), wk | 35 4/7 (34 1/7 to 36 2/7) | 35 4/7 (34 1/7-36 2/7) | 35 3/7 (34 0/7-36 2/7) | .12a |
| Admission to birth interval, median (IQR), d | 0 (0-2) | 1 (0-2) | 1 (0-2) | .44a |
| Antenatal steroids | 2738 (29.33) | 707 (25.70) | 3445 (28.51) | <.001b |
| Mode of delivery | ||||
| Spontaneous | 4272 (45.79) | 1280 (46.53) | 5554 (45.96) | .17b |
| Cesarean | 5060 (54.21) | 1471 (53.47) | 6531 (54.04) | .49b |
| Emergency cesareanc | 291 (5.75) | 104 (7.07) | 395 (6.05) | .06b |
| Stillbirth | 137 (1.47) | 41 (1.49) | 178(1.47) | .93b |
| Very preterm infants (<32 wk) | ||||
| No | 2064 | 572 | 2636 | NA |
| Routine medical check-ups during pregnancy | ||||
| Median (IQR), No. | 6 (5-8) | 6 (5-8) | 6 (5-8) | .90a |
| Missing, No. | 44 | 96 | 544 | NA |
| Maternal age, median (IQR), y | 32 (28-36) | 32 (29-36) | 32 (28-36) | .65a |
| GA at admission, median (IQR), wk | 27 2/7 (24 3/7 to 29 6/7) | 27 2/7 (24 5/7 to 29 5/7) | 27 2/7 (24 4/7 to 29 6/7) | .54a |
| Admission to birth interval, d | 3 (1-9) | 2 (1-8) | 3 (1-9) | .18a |
| Antenatal steroids | 1624 (78.67) | 441 (77.10) | 2065 (78.34) | .42b |
| Mode of delivery | ||||
| Spontaneous | 550 (26.65) | 147 (25.70) | 697 (26.44) | .04b |
| Cesarean | 1514 (73.35) | 425 (74.30) | 1939 (73.56) | .65b |
| Emergency cesarean deliveryc | 206 (13.60) | 61 (14.35) | 267 (13.77) | .69b |
| Stillbirth | 267 (12.94) | 76 (13.29) | 343 (13.01) | .83b |
Abbreviations: GA, gestational age; NA, not applicable.
a
Test used: Wilcoxon test.
b
Test used: Pearson test.
c
Relative frequency is calculated in relation to all cesarean deliveries.