HES data set a
| 1995 b
| 2006 (<26 weeks) c
| Percentage change d
| 2006 (<27 weeks) e
|
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| Live | Still | Not | Total | Live | Still | Not | Total | | Live | Still | Not | Total |
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| births | births | known | | births | births | known | | | births | births | known | |
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Reported | 621 | 213 | 33 | 867 | 887 | 121 | 180 | 1188 | 37 % | 1856 | 201 | 278 | 2535 |
“True” | 396 | 16 | 10 | 422 | 699 | 127 | 187 | 1013 | 140 % | 1158 | 213 | 291 | 1662 |
“Confirmed” | 282 | 13 | 5 | 300 | 412 | 81 | 75 | 568 | 89 % | 684 | 134 | 114 | 932 |
“Misclassified” | 339 | 200 | 28 | 567 | 475 | 40 | 105 | 620 | 9 % | 1172 | 67 | 364 | 1603 |
- Changes in the number of births in Hospital Episode Statistics (HES) data between 1995 and 2006: reported, “true”, “confirmed” and “misclassified” data
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aFor each year, data sets were created based upon : a) gestational age as reported in the original HES data; b) only the “true” data identified by the data linkage exercise (i.e. contained in both HES and EPICure); c) HES data “confirmed” by the “true” data; and, d) “misclassified” data, which are those reported by HES but that were not identified as “true” during data linkage
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bIn 1995, data were available from March 1st – December 31st for babies of <26 completed weeks gestational age
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cComparison data sets from 2006 were created to include babies born between 1st March and 31st December at less than 26 weeks gestational age
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dThe total percentage increase in all births is presented
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eThe complete data sets from 2006 include births of <27 completed weeks gestational age from the entire year