Descriptive statistics by birth order, Swedish Military Conscription Register
| All birth orders | 1 | 2 | 3 | 4 | 5 | 6+ | |
|---|---|---|---|---|---|---|---|
| Full sample | |||||||
| Number of persons (total, %) | 652518, 100 | 220563, 33.8 | 236527, 36.2 | 122008, 18.7 | 44142, 6.8 | 16378, 2.5 | 12900, 2.0 |
| Height, cm (mean, SD) | 179.2, 6.5 | 179.4, 6.5 | 179.4, 6.5 | 179.2, 6.5 | 178.7, 6.6 | 178.2, 6.5 | 177.6, 6.5 |
| Birth year (mean, SD) | 1967, 8.8 | 1965, 8.3 | 1968, 8.9 | 1968, 8.8 | 1966, 8.6 | 1965, 8.2 | 1963, 7.8 |
| Maternal age (years (mean, SD)) | 27.2, 5.4 | 23.7, 4.0 | 27.1, 4.4 | 30.0, 4.6 | 32.1, 4.7 | 33.7, 4.7 | 35.9, 4.6 |
| Conscription age (years (mean, SD)) | 18.3, 0.4 | 18.3, 0.5 | 18.3, 0.4 | 18.2, 0.4 | 18.2, 0.4 | 18.2, 0.4 | 18.2, 0.5 |
| Number of brothers in the data (mean, SD) | 1.3, 0.6 | 1.2, 0.5 | 1.2, 0.5 | 1.4, 0.6 | 1.6, 0.8 | 1.8, 0.9 | 2.0, 1.2 |
| Family size (total number of children (mean, SD)) | 3.1, 1.3 | 2.6, 0.9 | 2.7, 0.9 | 3.4, 1.0 | 4.3, 1.2 | 5.2, 1.5 | 7.2, 2.2 |
| Family SEP high (a) (%) | 47.8 | 51.9 | 51.0 | 45.4 | 34.6 | 25.3 | 16.1 |
| Cohorts for which birth weight and birth length are observed | |||||||
| Number of persons (total, %) | 139963, 100 | 51153, 36.5 | 59560, 42.6 | 21830, 15.6 | 5250, 3.8 | 1340, 1.0 | 830, 0.6 |
| Height (cm (mean, SD)) | 179.8, 6.5 | 179.8, 6.5 | 179.8, 6.5 | 179.8, 6.5 | 179.5, 6.7 | 179.1, 6.6 | 179.0, 6.6 |
| Birth year (mean, SD) | 1978, 2.9 | 1976, 2.3 | 1978, 2.7 | 1979, 2.7 | 1979, 2.8 | 1979, 2.8 | 1978, 2.9 |
| Maternal age (years (mean, SD)) | 27.0, 4.6 | 24.5, 3.9 | 27.4, 4.0 | 29.8, 4.0 | 31.7, 4.0 | 33.3, 4.1 | 35.4, 4.1 |
| Conscription age (years (mean, SD)) | 18.2, 0.3 | 18.2, 0.4 | 18.2, 0.3 | 18.2, 0.3 | 18.2, 0.3 | 18.2, 0.3 | 18.2, 0.3 |
| Number of brothers in the data (mean, SD) | 1.1, 0.3 | 1.1, 0.3 | 1.1, 0.3 | 1.2, 0.4 | 1.3, 0.5 | 1.3, 0.6 | 1.5, 0.8 |
| Family size (total number of children (mean, SD)) | 2.8, 1.0 | 2.5, 0.7 | 2.6, 0.7 | 3.3, 0.8 | 4.1, 1.1 | 5.0, 1.5 | 7.4, 2.7 |
| Family SEP high (a) (% (mean, SD)) | 55.3 | 56.6 | 56.4 | 53.7 | 46.3 | 38.6 | 27.7 |
| Birth weight (g (mean, SD)) | 3564, 554 | 3450, 526 | 3601, 550 | 3609, 590 | 3572, 624 | 3556, 635 | 3684, 623 |
| Birth length (cm (mean, SD)) | 50.8, 2.3 | 50.7, 2.3 | 50.9, 2.3 | 50.9, 2.4 | 50.7, 2.5 | 50.6, 2.6 | 51.1, 2.5 |
Male birth cohorts 1951–1983.
SEP, socioeconomic position.