Table 2.
Demographic and pregnancy characteristics of women with antenatal obstetric hospitalizations in Denmark 2003–2012
| Maternal characteristics | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|
|
| |||||||||||
| n (%) | n (%) | n (%) | n (%) | n (%) | n (%) | n (%) | n (%) | n (%) | n (%) | n (%) | |
| Overall pregnancies | 63,328 | 63,423 | 63,107 | 63,838 | 62,94 | 63,737 | 61,582 | 62,244 | 57,714 | 55,963 | 617,906 |
| Overall PTD (% of overall pregnancies) | 944 (1.5) | 963 (1.5) | 945 (1.5) | 900 (1.4) | 987 (1.6) | 935 (1.5) | 861 (1.4) | 943 (1.5) | 849 (1.5) | 830 (1.5) | 9,157 (1.5) |
| Overall pregnancies with AOH | 5,449 (100) | 5,326 (100) | 5,159 (100) | 4,907 (100) | 5,042 (100) | 4,955 (100) | 4,801 (100) | 4,551 (100) | 4,193 (100) | 3,983 (100) | 48,366 (100) |
| PTD after AOH (% of overall PTD) | 375 (40) | 410 (43) | 420 (44) | 362 (40) | 430 (44) | 399 (43) | 390 (45) | 402 (43) | 369 (44) | 365 (44) | 3,922 (43) |
| Maternal age, yearsa | |||||||||||
| <20 | 130 (2) | 100 (2) | 117 (2) | 142 (3) | 106 (2) | 149 (3) | 130 (3) | 118 (2) | 102 (2) | 90 (2) | 1,184 (2) |
| 20–29 | 2,515 (46) | 2,429 (46) | 2,272 (44) | 2,176 (44) | 2,163 (43) | 2,122 (43) | 2,042 (43) | 1,996 (44) | 1,826 (44) | 1,818 (46) | 21,359 (44) |
| 30–39 | 2,645 (49) | 2,628 (49) | 2,588 (50) | 2,402 (49) | 2,564 (51) | 2,470 (50) | 2,428 (50) | 2,263 (50) | 2,062 (49) | 1,877 (47) | 23,927 (50) |
| ≥40 | 159 (3) | 169 (3) | 182 (4) | 187 (4) | 209 (4) | 214 (4) | 201 (4) | 174 (4) | 180 (4) | 181 (5) | 1,858 (4) |
| Nulliparity | 2,692 (49) | 2,580 (48) | 2,487 (48) | 2,360 (48) | 2,383 (47) | 2,338 (47) | 2,315 (48) | 2,265 (50) | 1,983 (47) | 2,018 (51) | 23,421 (49) |
| Singleton pregnancy | 4,998 (92) | 4,905 (92) | 4,720 (92) | 4,466 (91) | 4,625 (92) | 4,532 (92) | 4,401 (92) | 4,144 (91) | 3,832 (91) | 3,592 (90) | 44,215 (91) |
| Body mass index, kg/m2a | |||||||||||
| <18.5 | na | 409 (8) | 372 (7) | 361 (7) | 366 (7) | 378 (8) | 329 (7) | 329 (7) | 201 (5) | 221 (6) | 2977 (6) |
| 18.5–24.9 | na | 2,653 (50) | 2,614 (51) | 2,462 (50) | 2,448 (49) | 2,412 (49) | 2,391 (50) | 2,321 (51) | 2,153 (51) | 2,097 (54) | 21,609 (45) |
| 25–29.9 | na | 1,071 (20) | 1,015 (20) | 930 (19) | 1,076 (21) | 1,040 (21) | 991 (21) | 993 (22) | 909 (22) | 907 (23) | 8,961 (19) |
| ≥30 | na | 786 (15) | 762 (15) | 752 (15) | 786 (16) | 825 (17) | 786 (16) | 743 (16) | 766 (18) | 677 (18) | 6,904 (14) |
| Education, yearsa | |||||||||||
| <10 | 1,436 (26) | 1,373 (26) | 1,310 (25) | 1,216 (25) | 1,224 (24) | 1,239 (25) | 1,127 (24) | 1,082 (24) | 1,005 (24) | 489 (12) | 11,501 (24) |
| 10–14 | 2,633 (48) | 2,508 (47) | 2,366 (51) | 2,205 (45) | 2,147 (43) | 2,063 (42) | 1,931 (40) | 1,784 (39) | 1,643 (39) | 1,900 (48) | 21,180 (44) |
| ≥15 | 1,211 (22) | 1,321 (25) | 1,347 (26) | 1,340 (27) | 1,470 (29) | 1,431 (29) | 1,500 (31) | 1,420 (31) | 1,293 (31) | 1,334 (34) | 13,667 (28) |
| In work status | 3,873 (71) | 3,769 (71) | 3,587 (70) | 3,598 (73) | 3,818 (76) | 3,784 (77) | 3,629 (76) | 3,326 (73) | 2,897 (69) | 2,662 (67) | 34,943 (72) |
| Smoking during pregnancy | 1,028 (19) | 986 (18) | 820 (16) | 778 (16) | 697 (14) | 697 (14) | 627 (13) | 556 (12) | 508 (12) | 490 (12) | 7,187 (15) |
| Cohabitant with partner | 4,597 (84) | 4,473 (84) | 4,334 (84) | 4,050 (82) | 4,143 (82) | 4,052 (82) | 3,890 (81) | 3,647 (80) | 3,367 (80) | 3,197 (80) | 39,750 (82) |
| Newborns of women with AOH | 5,916 (100) | 5,766 (100) | 5,618 (100) | 5,359 (100) | 5,473 (100) | 5,387 (100) | 5,213 (100) | 4,966 (100) | 4,571 (100) | 4,379 (100) | 52,648 (100) |
| Apgar score <7 at 5 minutes | 101 (1.7) | 73 (1.2) | 96 (1.7) | 82 (1.5) | 85 (1.6) | 90(1.7) | 82 (1.6) | 92 (1.9) | 75 (1.6) | 78 (1.8) | 854 (1.6) |
| Admission at NICU ≥1 day | 1,561 (26.4) | 1,491 (25.8) | 1,501 (26.7) | 1,406 (26.2) | 1,431 (26.1) | 1,397 (25.9) | 1,300 (24.9) | 1,313 (26.4) | na | na | 11,400 (26.1) |
| Infant deathsb | 188 (3.2) | 238 (4.1) | 261 (4.6) | 220 (4.1) | 198 (3.6) | 214 (4.0) | 189 (3.6) | 176 (3.5) | 173 (3.8) | 159 (3.6) | 2,016 (3.8) |
Notes:
a
Totals may vary as data were missing for some categories;
b
Infant deaths (stillbirths, perinatal, and neonatal deaths). AOH relates to more than 3 days prior to delivery and lasting 1 day or more.
Abbreviations: AOH, antenatal obstetric hospitalization; na, not applicable; NICU, neonatal intensive care unit; PTD, very preterm delivery <34 gestational weeks.