Table 3 Characteristics of all reported singleton pregnancies^a

Total number of pregnancies

274 (100%)

78 (100%)

352 (100%)

667 (100%)

Mean (standard deviation) maternal age at conception

25.0 (5.5)

30.1 (5.6)

25.6 (5.8)

26.3 (6.1)

Pregnancy type

   Live birth

224/274 (81.8%)

33/78 (42.3%)

257/352 (73.0%)

553/667 (82.9)

   Foetal death

47/274 (17.2%)

43/78 (55.1%)

90/352 (25.6%)

109/667 (16.3%)

   First-trimester miscarriage (0–12 weeks)^b

28/274 (10.2%)

34/78 (43.6%)

62/352 (17.6%)

90/667 (13.4%)

   Mid-trimester miscarriage (13–23 weeks)^b

3/259 (1.2%)

4/49 (8.2%)

7/315 (2.2%)

9/605 (1.5%)

   Miscarriage missing gestation

3/274 (1.1%)

1/78 (1.3%)

4/352 (1.1%)

1/667 (0.1%)

   Stillbirth (≥ 24 weeks)^c

13/237 (5.5%)

4/37 (10.8%)

17/274 (6.2%)

9/562 (1.6%)

   Ectopic pregnancy

3/274 (1.1%)

2/78 (2.6%)

5/352 (1.4%)

5/667 (0.7%)

Reported gestation of live births (completed weeks)

   All pregnancies ending in live birth

224 (100%)

33 (100%)

257 (100%)

553 (100%)

   < 24 weeks

5 (2.2%)

3 (9.1%)

8 (3.1%)

20 (3.6%)

   24–31 weeks

2 (0.9%)

3 (9.1%)

5 (2.0%)

2 (0.4%)

   32–36 weeks

5 (2.2%)

1 (3.0%)

6 (2.3%)

4 (0.7%)

   All preterm (< 37 weeks)

12 (5.4%)

7 (21.2%)

19 (7.4%)

26 (4.7%)

   37–42 weeks

212 (94.6%)

26 (78.8%)

238 (92.6%)

526 (95.1%)

   42–46 weeks

0 (0%)

0 (0%)

0

1 (0.2%)

Reported gestation of foetal deaths (completed weeks)

   All pregnancies ending in foetal death^b

47 (100%)

43 (100%)

90 (100%)

109 (100%)

   < 8 weeks

17 (36.2%)

25 (58.1%)

42 (46.7%)

63 (57.8%)

   8–12 weeks

11 (23.4%)

9 (20.9%)

20 (22.2%)

28 (25.7%)

   13–15 weeks

2 (4.3%)

0 (0%)

2 (2.2%)

4 (3.7%)

   16–23 weeks

1 (2.1%)

4 (9.3%)

5 (5.6%)

5 (4.6%)

   24–36 weeks

6 (12.7%)

4 (9.3%)

10 (11.1%)

4 (3.7%)

   ≥ 37 weeks

7 (14.9%)

0 (0%)

7 (7.7%)

3 (2.8%)

   Missing gestation category

3 (6.4%)

1 (2.3%)

4 (4.4%)

2 (1.8%)