Table 3.
Time trends of the accuracy of hospital discharge codes in identifying true acute ischaemic stroke cases (positive predictive value) stratified by searching strategies.
|
Full codes (I63, I64): |
Stroke-specific codes (I63): |
|||||
|---|---|---|---|---|---|---|
| All admissions | Excluding re-admission ≤28 days | First admission only | All admissions | Excluding re-admission ≤28 days | First admission only | |
| Year | (TP/total, %) | (TP/total, %) | (TP/total, %) | (TP/total, %) | (TP/total, %) | (TP/total, %) |
| 2002–2005 | 186/283 (65.7) | 185/234 (79.1) | 179/226 (79.2) | 67/97 (69.1) | 66/82 (80.5) | 66/81 (81.5) |
| 2005–2008 | 168/226 (74.3) | 166/213 (77.9) | 158/204 (77.5) | 94/116 (81.0) | 92/110 (83.6) | 87/105 (82.9) |
| 2008–2011 | 209/232 (90.1) | 207/228 (90.8) | 189/210 (90.0) | 172/190 (90.5) | 170/186 (91.4) | 155/171 (90.6) |
| 2011–2014 | 238/262 (90.8) | 235/256 (91.8) | 218/236 (92.4) | 220/240 (91.7) | 217/234 (92.7) | 201/215 (93.5) |
| 2014–2017 | 221/249 (88.8) | 215/238 (90.3) | 196/216 (90.7) | 189/209 (90.4) | 183/198 (92.4) | 167/180 (92.8) |
| ptrend | <0.0001 | <0.0001 | <0.0001 | <0.0001 | 0.0003 | 0.0002 |
| Total | 1022/1252 (81.6) | 1008/1169 (86.2) | 940/1092 (86.1) | 742/852 (87.1) | 728/810 (89.9) | 676/752 (89.9) |
TP: true positive cases.