Table 1.
Descriptive Statistics for births included in the analysis (n=1,800,906)
| Characteristics | Total | % | Median (10th , 90th centile) |
|---|---|---|---|
| Birth outcomes | |||
| Birth weight (grams) | 1,800,906 | 100 | 3380 (2700, 4030) |
| Very Low birth weight | 14,517 | 1 | - |
| Low birth weight | 102,006 | 6 | - |
| Gestational age (weeks) | 1,800,906 | - | 40 (37, 41) |
| Preterm Birth | 126,527 | 7 | - |
| Small for gestational age | 175,940 | 10 | - |
| Sex of baby | 1,800,906 | ||
| Female | 885,328 | 49 | - |
| Male | 915,578 | 51 | - |
| Maternal Age | 1,800,906 | ||
| 16-20 (0) | 174,426 | 10 | - |
| 20-25 (1) | 381,736 | 21 | - |
| 26-29 (2) | 504,848 | 28 | - |
| 30-35 (3) | 470,137 | 26 | - |
| >35-44 (4) | 269,759 | 15 | - |
| Region | 1,793,119 | 100 | |
| Missing | 7,787 | 0 | |
| North East | 78,652 | 4 | - |
| North West | 247,827 | 14 | - |
| Yorkshire and Humber | 162,949 | 9 | - |
| East Midlands | 143,720 | 8 | - |
| West Midlands | 204,582 | 11 | - |
| East of England | 196,625 | 11 | - |
| London | 371,630 | 21 | - |
| South East | 225,941 | 13 | - |
| South West | 161,193 | 9 | - |
| Ethnicity | 1,597,430 | 89 | |
| Missing | 203,476 | 11 | |
| White | 1,214,893 | 67 | - |
| Black | 113,458 | 6 | - |
| Asian | 162,459 | 9 | - |
| Other | 106,620 | 6 | - |
| Deprivation (quintiles) | 1,658,672 | 92 | |
| Missing | 142,234 | 8 | |
| 0 (least deprived) | 239,802 | 14 | - |
| 1 | 253,822 | 15 | - |
| 2 | 295,051 | 18 | - |
| 3 | 368,390 | 22 | - |
| 4 (most deprived) | 501,607 | 30 | - |