Table 2 Descriptive statistics for imputed and complete case samples

Young Adult SES Degree attainment (outcome)

6193

4425

 High SES

499 (36.8%)

25.5% (0.6%)

871 (64.0%)

51.8% (0.8%)

 Low SES

859 (63.3%)

74.8% (0.6%)

489 (36.0%)

48.2% (0.8%)

Young Adult SES occupation status (outcome)

5158

 High SES

742 (54.6%)

60.5% (0.5%)

–

3.20 (0.03)

 Low SES

616 (45.4%)

39.5% (0.5%)

–

–

MRB total (exposure)

5805

2345

 Mean (SD)

1.74 (1.4)

1.88 (0.02)

2.91 (1.9)

3.20 (0.03)

 Median (IQR)

2 (1–3)

–

3 (1–4)

–

Maternal Education SES (moderator)

9691

9001

 High SES

567 (41.8%)

29.3% (0.5%)

697 (51.3%)

39.8% (0.5%)

 Low SES

791 (58.3%)

70.7% (0.5%)

663 (48.8%)

60.2% (0.5%)

Household Equivalised Income (moderator)

9691

9001

 High SES (higher income brackets)

209 (15.4%)

22.5% (0.4%)

694 (51.0%)

42.1% (0.5%)

 Low SES (lower income brackets)

1149 (84.6%)

77.5% (0.4%)

666 (49.0%)

57.9% (0.5%)

Parental social class (moderator)

9691

9001

 High SES

338 (24.9%)

25.3% (0.4%)

908 (66.8%)

57.4% (0.5%)

 Low SES

1020 (75.1%)

74.7% (0.4%)

452 (33.2%)

42.6% (0.5%)

Gender

9691

9001

 Female

779 (57.4%)

51.7% (0.5%)

840 (61.8%)

48.8% (0.5%)

 Male

579 (42.6%)

48.3% (0.5%)

520 (38.2%)

51.2% (0.5%)

Season of birth

9001

 Autumn

–

–

–

456 (33.5%)

33.0% (0.5%)

 Winter

–

–

–

186 (13.7%)

14.1% (0.5%)

 Spring

–

–

–

329 (24.2%)

23.2% (0.5%)

 Summer

–

–

–

389 (28.6%)

29.7% (0.5%)

Previous educational attainment/ability

 IQ at age 8 Mean (SD)

–

–

–

5841

109.69 (15.0)

103.5 (0.2)

 KS2 educational attainment Mean (SD)

–

–

–

6533

913.84 (154.6)

800.6 (2.6)

Conduct problems score (age 10 years)

9083

6007

 0

1144 (84.2%)

80.0% (0.4%)

983 (72.3%)

67.4 (0.6%)

 1

178 (13.1%)

15.2% (0.4%)

316 (23.2%)

24.9 (0.6%)

 2

36 (2.7%)

4.8% (0.2%)

61 (4.5%)

7.7% (0.5%)