Population characteristics of the singleton pregnancies between 2003 and 2017 by deprivation quintile
| Q1 (Least Deprived), N=478 809 | Q2, N=474 282 | Q3 N=477 146 | Q4, N=473 164 | Q5 (Most Deprived) N=474 543 | Total, N=2 377 944 | |
| Characteristics | ||||||
| Maternal age*, mean (SD) | 31.1 (4.6) | 30.9 (4.6) | 30.7 (4.7) | 30.2 (5.0) | 29.7 (5.4) | 30.5 (4.9) |
| 2003–2007 | 31.2 (4.4) | 31.0 (4.5) | 30.7 (4.7) | 30.2 (5.0) | 29.2 (5.5) | 30.5 (4.9) |
| 2008–2011 | 31.1 (4.7) | 30.8 (4.7) | 30.7 (4.8) | 30.1 (5.1) | 29.7 (5.4) | 30.5 (5.0) |
| 2012–2017 | 30.9 (4.6) | 30.9 (4.6) | 30.7 (4.7) | 30.4 (4.9) | 30.1 (5.2) | 30.6 (4.8) |
| Primiparous*, % | 41.7 | 43.5 | 45.7 | 48.2 | 47.1 | 45.2 |
| 2003–2007 | 41.9 | 43.9 | 46.1 | 49.2 | 47.7 | 45.7 |
| 2008–2011 | 41.9 | 43.8 | 46.1 | 49.0 | 47.8 | 45.7 |
| 2012–2017 | 41.3 | 42.8 | 45.0 | 46.9 | 46.2 | 44.5 |
| Non-Western ethnicity*, % | 5.1 | 7.4 | 11.7 | 17.5 | 40.6 | 16.6 |
| 2003–2007 | 3.4 | 5.3 | 9.6 | 15.4 | 40.8 | 14.5 |
| 2008–2011 | 4.7 | 7.4 | 12.3 | 18.3 | 41.7 | 17.0 |
| 2012–2017 | 6.9 | 9.4 | 13.2 | 18.7 | 39.8 | 18.1 |
| Urban areas, % | 19.4 | 46.9 | 67.5 | 80.4 | 89.8 | 60.7 |
| 2003–2007 | 20.1 | 42.4 | 63.4 | 77.7 | 88.5 | 57.4 |
| 2008–2011 | 16.0 | 44.0 | 70.5 | 80.0 | 90.3 | 60.2 |
| 2012–2017 | 21.3 | 53.2 | 69.0 | 82.8 | 90.4 | 63.9 |
| Perinatal outcomes | ||||||
| Perinatal mortality, % | 0.52 | 0.50 | 0.51 | 0.55 | 0.65 | 0.54 |
| 2003–2007 | 0.72 | 0.64 | 0.66 | 0.70 | 0.87 | 0.72 |
| 2008–2011 | 0.49 | 0.50 | 0.51 | 0.54 | 0.62 | 0.53 |
| 2012–2017 | 0.37 | 0.36 | 0.38 | 0.42 | 0.51 | 0.41 |
| Premature birth, % | 5.53 | 5.60 | 5.83 | 6.07 | 6.41 | 5.89 |
| 2003–2007 | 5.80 | 5.87 | 6.14 | 6.26 | 6.92 | 6.18 |
| 2008–2011 | 5.67 | 5.64 | 5.93 | 6.30 | 6.46 | 6.00 |
| 2012–2017 | 5.19 | 5.32 | 5.49 | 5.75 | 5.99 | 5.56 |
| Small for gestational age*, % | 9.39 | 10.10 | 10.92 | 12.19 | 14.52 | 11.42 |
| 2003–2007 | 10.20 | 10.76 | 11.61 | 13.03 | 15.83 | 12.19 |
| 2008–2011 | 9.07 | 9.96 | 10.64 | 12.20 | 14.11 | 11.19 |
| 2012–2017 | 8.89 | 9.59 | 10.52 | 11.52 | 13.82 | 10.92 |
Data are presented as numbers and percentages, mean and SD.
Bold numbers refer to values for the full study period (2003-2017).
Total number of registered births per year cohort: 2003-2007, N=791,139 (35.6%); 2008-2011, N=648,535 (29.2%); 2012-2017, N=938,270 (35.3%).
Urban ≥ 2500 households/km2
*Variable has missing data (maternal age: 0.06%; parity: 0.01%; ethnicity: 0.71%; SGA: 0.09%).