TABLE 1.
Study Population of Danish Opposite-Sex and Same-Sex Twins Born 1970–1989
| Females | Males | ||||||
|---|---|---|---|---|---|---|---|
| Characteristics | Opposite-sex | Same-sex | All | Opposite-sex | Same-sex | All | All Total |
| N (%) | 408 (13.6) | 1,383 (46.1) | 1,791 (59.8) | 350 (11.7) | 856 (28.6) | 1,206 (40.2) | 2,997 (100.0) |
| Mean (SD) age at participation | 29.3 (6.3) | 30.0 (6.0) | 29.8 (6.03) | 29.2 (6.2) | 30.1 (6.2) | 29.8 (6.2) | 29.8 (6.1) |
| Religious denominations | |||||||
| The Danish National | 363 (89.0) | 1.169 (84.5) | 1,532 (85.5) | 271 (77.4) | 671 (78.6) | 942 (78.2) | 2,474 (82.6) |
| Evangelical Church | |||||||
| Catholic, Muslim, and Othera | 3 (0.7) | 51 (3.7) | 54 (3.0) | 7 (2.0) | 10 (1.2) | 17 (1.4) | 71 (2.4) |
| Not a member | 42 (10.3) | 163 (11.8) | 205 (11.5) | 72 (20.6) | 173 (20.3) | 245 (20.4) | 450 (15.0) |
| Education of the main provider in childhood* |
|||||||
| Basic school | 41 (10.1) | 189 (13.7) | 230 (12.8) | 34 (9.7) | 72 (8.4) | 106 (8.8) | 336 (11.2) |
| Vocational school, secondary education, and short higher education |
204 (50.0) | 719 (52.0) | 923 (51.5) | 172 (49.1) | 459 (53.6) | 631 (52.3) | 1,554 (51.9) |
| Medium higher education and bachelor’s degree |
93 (22.8) | 266 (19.2) | 359 (20.0) | 77 (22.0) | 191 (22.3) | 268 (22.2) | 627 (20.9) |
| Higher academic or professional degree |
70 (17.2) | 209 (15.1) | 279 (15.6) | 67 (19.1) | 134 (15.7) | 201 (16.7) | 480 (16.0) |
Note:
a
Jew, Hindu, Jehovah’s witnesses, Buddhist etc.
*
p = .039 for education of the main provider in childhood for OS versus SS twins for both sexes combined.