Table 1 Description of the study sample (n = 25 655)
Total sample (n = 25 655) | NSHD 1946 (n = 3 693) | 1958 NCDS (n = 12 519) | 1970 BCS (n = 9 443) | ||||||
|---|---|---|---|---|---|---|---|---|---|
Missing (n (%)) | Missing (n (%)) | Missing (n (%)) | Missing (n (%)) | ||||||
Sex | |||||||||
Males | n (%) | 12 465 (48.6) | – | 1 872 (50.7) | – | 6 291 (50.3) | – | 4 302 (45.6) | – |
Females | n (%) | 13 190 (51.4) | 1 821 (49.3) | 6 228 (49.7) | 5 141 (54.4) | ||||
Ethnicity | |||||||||
White British | n (%) | 24 884 (97.4) | 103 (0.4) | 3 693 (100) | 0 | 12 235 (97.8) | 6 (0.05) | 8 956 (95.8) | 97 (1.03) |
Othera | n (%) | 668 (2.6) | 0 | 278 (2.2) | 390 (4.2) | ||||
Birthweight (kg) | Mean (SD) | 3.3 (0.5) | 1 686 (6.6) | 3.4 (0.5) | 14 (0.04) | 3.3 (0.5) | 1 013 (8.1) | 3.3 (0.5) | 659 (7.0) |
Childhood social class | |||||||||
Professional | n (%) | 1 190 (5.3) | 3 031 (11.8) | 205 (6.3) | 447 (12.1) | 505 (4.7) | 1 683 (13.4) | 480 (5.6) | 901 (9.5) |
Intermediate | n (%) | 5 032 (22.2) | 637 (19.6) | 2 191 (20.2) | 2204 (25.8) | ||||
Skilled non-manual | n (%) | 2 630 (11.6) | 513 (15.8) | 1 163 (10.7) | 954 (11.2) | ||||
Skilled manual | n (%) | 8 901 (39.3) | 1 088 (33.5) | 4 475 (41.3) | 3 338 (39.1) | ||||
Partly skilled manual | n (%) | 3 301 (14.6) | 618 (19.0) | 1 600 (14.8) | 1 083 (12.7) | ||||
Unskilled manual | n (%) | 1 570 (6.9) | 185 (5.7) | 902 (8.3) | 483 (5.7) | ||||
Mother left education at mandatory leaving age | |||||||||
Yes | n (%) | 16 862 (69.5) | 1388 (5.4) | 2 418 (71.3) | 301 (8.2) | 8 792 (74.0) | 637 (5.1) | 5652 (62.9) | 450 (4.8) |
Father left education at mandatory leaving age | |||||||||
Yes | n (%) | 15 744 (69.4) | 2 955 (11.5) | 2 313 (69.0) | 342 (9.3) | 3 029 (74.5) | 635 (5.1) | 2 889 (61.3) | 1 978 (21.0) |