Table 1 Maternal demographic characteristics for the cohort (n = 1111) and comparison group (n = 23,414)

Deprivation at childbirth

Quintile 1: Most Deprived

549 (49.4)

11,641 (49.7)

0.998

Quintile 2

293 (26.4)

6186 (26.4)

Quintile 3

158 (14.2)

3317 (14.2)

Quintile 4

80 (7.2)

1633 (7.0)

Quintile 5: Least Deprived

31 (2.8)

637 (2.7)

Age at current birth

< 21 years

276 (24.8)

5,830 (24.9)

1.0

21 to 25 years

297 (26.7)

6281 (26.8)

26 to 30 years

259 (23.3)

5475 (23.4)

31 to 35 years

172 (15.5)

3601 (15.4)

> 35 years

107 (9.6)

2227 (9.5)

Age at current birth (mean (SD))^a

26.0 (6.5)

26.1 (6.2)

0.482

Age at entry to motherhood

< 21 years

699 (63.5)

9847 (42.7)

< 0.001

21 to 25 years

245 (22.3)

6520 (28.3)

26 to 30 years

82 (7.5)

3895 (16.9)

31 to 35 years

44 (4.0)

1935 (8.4)

> 35 years

30 (2.7)

849 (3.7)

Missing

11

368

Age at entry to motherhood (mean (SD))^a

20.9 (5.0)

23.2 (5.6)

< 0.001