Table 1 Demographic characteristics by sex and sibship composition in Study 1 and Study 2.
Variable | Study 1 | Study 2 | ||||||
|---|---|---|---|---|---|---|---|---|
GGG (n = 4317) | BGB (n = 3679) | BBB (n = 5205) | GBG (n = 4032) | GG(n = 26,528) | BG (n = 31577) | BB (n = 28,794) | GB (n = 31,016) | |
Birth cohort | ||||||||
1973 | 438 (10.1) | 394 (9.8) | 558 (10.7) | 369 (10) | 3518 (13.3) | 4140 (13.1) | 3857 (13.4) | 4077 (13.1) |
1974 | 469 (10.9) | 427 (10.6) | 577 (11.1) | 385 (10.5) | 3514 (13.2) | 4099 (13) | 3611 (12.5) | 3994 (12.9) |
1975 | 452 (10.5) | 429 (10.6) | 559 (10.7) | 390 (10.6) | 3193 (12) | 3835 (12.1) | 3527 (12.2) | 3740 (12.1) |
1976 | 496 (11.5) | 435 (10.8) | 642 (12.3) | 394 (10.7) | 2978 (11.2) | 3552 (11.2) | 3165 (11) | 3419 (11) |
1977 | 541 (12.5) | 489 (12.1) | 556 (10.7) | 432 (11.7) | ,2798 (10.5) | 3269 (10.4) | 3112 (10.8) | 3342 (10.8) |
1978 | 495 (11.5) | 428 (10.6) | 534 (10.3) | 399 (10.8) | 2599 (9.8) | 3114 (9.9) | 2859 (9.9) | 3030 (9.8) |
1979 | 477 (11) | 479 (11.9) | 565 (10.9) | 445 (12.1) | 2665 (10) | 3112 (9.9) | 2823 (9.8) | 3097 (10) |
1980 | 461 (10.7) | 461 (11.4) | 649 (12.5) | 423 (11.5) | 2711 (10.2) | 3293 (10.4) | 3082 (10.7) | 3270 (10.5) |
1981 | 481 (11.1) | 486 (12.1) | 562 (10.8) | 440 (12) | 2532 (9.5) | 3141 (9.9) | 2750 (9.6) | 3036 (9.8) |
1982 | 7 (0.2) | 4 (0.1) | 3 (0.1) | 2 (0.1) | 20 (0.1) | 22 (0.1) | 8 (0) | 11 (0) |
Sibship type | ||||||||
Siblings with identical parents | 3928 (91) | 3544 (87.9) | 4797 (92.2) | 3282 (89.2) | 25,015 (94.3) | 29,741 (94.2) | 27,545 (95.7) | 29,227 (94.2) |
Education | ||||||||
Lower than Bachelor’s degree | 1599 (37) | 1507 (37.4) | 2707 (52) | 1950 (53) | 8911 (33.6) | 10,742 (34) | 14,249 (49.5) | 15,573 (50.2) |
Bachelor’s degree | 573 (13.3) | 484 (12) | 6,99 (13.4) | 536 (14.6) | 3446 (13) | 4096 (13) | 4230 (14.7) | 4451 (14.4) |
Master’s degree or higher | 2145 (49.7) | 2041 (50.6) | 1799 (34.6) | 1193 (32.4) | 14,171 (53.4) | 16,739 (53) | 10,315 (35.8) | 10,992 (35.4) |
Occupation at age 35 | ||||||||
Legislators, sen. officials, managers | 164 (3.8) | 158 (3.9) | 357 (6.9) | 265 (7.2) | 1253 (4.7) | 1509 (4.8) | 2342 (8.1) | 2382 (7.7) |
Professional occupations | 1422 (32.9) | 1315 (32.6) | 1360 (26.1) | 901 (24.5) | 8968 (33.8) | 10,688 (33.8) | 8037 (27.9) | 8647 (27.9) |
Technicians and associate professionals | 1025 (23.7) | 991 (24.6) | 1065 (20.5) | 798 (21.7) | 6829 (25.7) | 8055 (25.5) | 6432 (22.3) | 6908 (22.3) |
Clerks and customer service personnel | 346 (8) | 309 (7.7) | 252 (4.8) | 154 (4.2) | 2274 (8.6) | 2648 (8.4) | 1320 (4.6) | 1454 (4.7) |
Service workers and sales personnel | 1057 (24.5) | 1006 (25) | 474 (9.1) | 336 (9.1) | 5626 (21.2) | 6810 (21.6) | 2626 (9.1) | 2732 (8.8) |
Skilled agricultural and fishery workers | 32 (0.7) | 25 (0.6) | 89 (1.7) | 67 (1.8) | 157 (0.6) | 212 (0.7) | 369 (1.3) | 417 (1.3) |
Crafts and related trades workers | 38 (0.9) | 32 (0.8) | 822 (15.8) | 587 (16) | 214 (0.8) | 223 (0.7) | 3892 (13.5) | 4197 (13.5) |
Machine operators, incl. transport | 116 (2.7) | 87 (2.2) | 642 (12.3) | 463 (12.6) | 547 (2.1) | 645 (2) | 3010 (10.5) | 3448 (11.1) |
Occupations not requiring training | 117 (2.7) | 109 (2.7) | 144 (2.8) | 108 (2.9) | 660 (2.5) | 787 (2.5) | 766 (2.7) | 831 (2.7) |
