All births in England linked to delivery HES records by region of usual residence, 2005–2014.
| Region | Number of ONS birth records | Linked to HES delivery record | Never linked to HES delivery record | Linkage rate |
| East Midlands | 456 324 | 448 489 | 7835 | 98.28 |
| East of England | 672 006 | 652 543 | 19 463 | 97.10 |
| London | 1298 130 | 1227 661 | 70 469 | 94.57 |
| North East | 307 532 | 301 141 | 6391 | 97.92 |
| North West | 867 881 | 850 726 | 17 155 | 98.02 |
| South Central | 462 848 | 455 243 | 7605 | 98.36 |
| South East Coast | 514 289 | 503 042 | 11 247 | 97.81 |
| South West | 566 860 | 559 043 | 7817 | 98.62 |
| West Midlands | 709 445 | 695 469 | 13 976 | 98.03 |
| Yorkshire/The Humber | 645 649 | 635 293 | 10 356 | 98.40 |
| Elsewhere | 10 989 | 9507 | 1482 | 86.51 |
| Home | 164 954 | 126 622 | 38 332 | 76.76 |
| Not stated | 5 | 3 | 2 | 60.00 |
| Total | 6676 912 | 6464 782 | 212 130 | 96.82 |
269313.4278 Pearson χ 2 statistic.
12 <df = (rows−1)× (columns− 1).
0.0000 <- getting the P value from the χ2 statistics and the df.
HES, Hospital Episode Statistics; ONS, Office for National Statistics.