Table 1.
Summary of anthropometric, obstetric and demographic variables for all National Health Service delivery episodes in Scotland from January 1981 to December 2010
| Characteristics | 1981–2010 | 2006–2010 | 2011 | 2012 | ||||
|---|---|---|---|---|---|---|---|---|
| n | % | n | % | n | % | n | % | |
| BMI (kg/m2) | 1,776,845 | 100.0 | 281,983 | 100.0 | 57,018 | 100.0 | 57,234 | 100.0 |
| <25 | 124,041 | 7.0 | 94,608 | 33.6 | 25,434 | 44.6 | 24,995 | 43.7 |
| 25–30 | 67,447 | 3.8 | 51,586 | 18.3 | 13,669 | 24.0 | 23,690 | 41.4 |
| 30–40 | 48,511 | 2.7 | 37,282 | 13.2 | 10,371 | 18.2 | 13,508 | 23.6 |
| Not known | 1,536,846 | 86.5 | 98,507 | 34.9 | 7,544 | 13.2 | 8,444 | 14.8 |
| GDM | 1,776,845 | 100.0 | 281.983 | 100.0 | 57.018 | 100.0 | 57,234 | 100.0 |
| Yes | 8,323 | 0.5 | 2,156 | 0.8 | 723 | 1.3 | 1,098 | 1.9 |
| No | 1,768,522 | 99.5 | 279,827 | 99.2 | 56,295 | 98.7 | 56,136 | 98.1 |
| Parity status | 1,776,845 | 100.0 | 281,983 | 100.0 | 57,018 | 100.0 | 57,234 | 100.0 |
| Multiparous | 971,996 | 54.7 | 145,553 | 51.6 | 29,235 | 51.3 | 31,711 | 55.4 |
| Primiparous | 799,769 | 45.0 | 135,268 | 48.0 | 26,923 | 47.2 | 25,415 | 44.4 |
| Not known | 5,080 | 0.3 | 1,162 | 0.4 | 860 | 1.5 | 108 | 0.2 |
| Smoking status | 1,776,845 | 100.0 | 281,983 | 100.0 | 57,018 | 100.0 | 57,234 | 100.0 |
| Yes | 232,360 | 37.0 | 52,133 | 18.5 | 10,292 | 18.1 | 10,226 | 17.9 |
| No | 657,668 | 13.1 | 197,528 | 70.0 | 43,025 | 75.5 | 43,824 | 76.6 |
| Not known | 886,817 | 49.9 | 32,322 | 11.5 | 3,701 | 6.5 | 3,184 | 5.6 |
| Maternal age | 1,776,845 | 100.0 | 281,983 | 100.0 | 57,018 | 100.0 | 57,234 | 100.0 |
| ≤24 years | 567,929 | 32.0 | 73,786 | 26.2 | 13,776 | 24.2 | 13,341 | 23.3 |
| 25–29 years | 561377 | 31.6 | 75,101 | 26.6 | 15,518 | 27.2 | 15,819 | 27.6 |
| 30–34 years | 435491 | 24.5 | 76,728 | 27.2 | 16,384 | 28.7 | 16,958 | 29.6 |
| ≥35 years | 212037 | 11.9 | 56,368 | 20.0 | 11,340 | 19.9 | 11,114 | 19.4 |
| Not known | 11 | 0.001 | 0 | 0 | 0 | 0.0 | 2 | 0.003 |
| SIMD quintiles | 1,776,845 | 100.0 | 281,983 | 100.0 | 57,018 | 100.0 | 57,234 | 100.0 |
| 1 | 484,447 | 27.3 | 72,605 | 25.7 | 15,161 | 26.6 | 15,100 | 26.4 |
| 2 | 352,668 | 19.8 | 58,677 | 20.8 | 12,105 | 21.2 | 12,197 | 21.3 |
| 3 | 313,108 | 17.6 | 52,733 | 18.7 | 10,638 | 18.7 | 10,930 | 19.1 |
| 4 | 297,438 | 16.7 | 50,788 | 18.0 | 9,916 | 17.4 | 9,728 | 17.0 |
| 5 | 290,896 | 16.4 | 45,993 | 16.3 | 8,898 | 15.6 | 8,952 | 15.6 |
| Not known | 38,288 | 2.2 | 1,187 | 0.4 | 300 | 0.5 | 327 | 0.6 |
| Fetal macrosomia | – | – | – | – | – | – | 57,234 | 100.0 |
| No | – | – | – | – | – | – | 49,380 | 86.3 |
| Yes | – | – | – | – | – | – | 7,854 | 13.7 |
| Births this pregnancy | – | – | – | – | – | – | 57234 | 100.0 |
| Multiple | – | – | – | – | – | – | 1,691 | 3.0 |
| Singleton | – | – | – | – | – | – | 55,543 | 97.0 |
| Offspring gender | 57,234 | 100.0 | ||||||
| Female | – | – | – | – | – | – | 27,868 | 48.7 |
| Male | – | – | – | – | – | – | 29,360 | 51.3 |
| Other/not Known | – | – | – | – | – | – | 6 | 0.01 |
Summary of anthropometric (body mass index [BMI]), obstetric (gestational diabetes mellitus [GDM] status, parity status, smoking status during pregnancy, number of births during the delivery episode, fetal macrosomia status, infant gender) and demographic (maternal age, Scottish Index of Multiple Deprivation [SIMD]) variables for all national Health Service delivery episodes in Scotland from 1 January 1981 to 31 December 2010 (dataset reference: IR2012‐01211; n = 1,776,845), 1 January 2006 to 31 December 2010 (dataset reference: subgroup from IR2012‐01211, n = 281,983), 1 January 2011 to 31st December 2011 (Dataset reference: IR2013‐02036; n = 57,018) and 1st January 2012 to 31 December 2012 (dataset reference: IR2015‐00505_macrosomia; n = 57,234). The datasets also include cases labeled as ‘not known’.