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Table 8 Changes in the number of births in HES data over time

From: Investigating increased admissions to neonatal intensive care in England between 1995 and 2006: data linkage study using Hospital Episode Statistics

HES data set a 1995 b 2006 (<26 weeks) c Percentage change d 2006 (<27 weeks) e
  Live Still Not Total Live Still Not Total   Live Still Not Total
  births births known   births births known    births births known  
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
  1. Changes in the number of births in Hospital Episode Statistics (HES) data between 1995 and 2006: reported, “true”, “confirmed” and “misclassified” data
  2. 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
  3. bIn 1995, data were available from March 1st – December 31st for babies of <26 completed weeks gestational age
  4. cComparison data sets from 2006 were created to include babies born between 1st March and 31st December at less than 26 weeks gestational age
  5. dThe total percentage increase in all births is presented
  6. eThe complete data sets from 2006 include births of <27 completed weeks gestational age from the entire year