Number of ONS birth records linked to HES birth records, England, 2005–2014
| Year of birth | Number of ONS Birth records | Number of ONS birth records linked to HES birth records | Percentage linked |
| 2005 | 617 613 | 609 778 | 98.73 |
| 2006 | 640 271 | 633 183 | 98.89 |
| 2007 | 659 061 | 651 551 | 98.86 |
| 2008 | 676 999 | 668 967 | 98.81 |
| 2009 | 675 330 | 669 926 | 99.20 |
| 2010 | 687 100 | 682 261 | 99.30 |
| 2011 | 688 681 | 683 768 | 99.29 |
| 2012 | 698 457 | 693 221 | 99.25 |
| 2013 | 668 433 | 662 963 | 99.18 |
| 2014 | 664 967 | 659 192 | 99.13 |
HES, Hospital Episode Statistics; ONS, Office for National Statistics.