Table 2.
Time trend of the accuracy of hospital discharge codes in identifying true acute stroke cases (positive predictive value) stratified by searching strategies.
|
Full non-specific codes for possible stroke (I60–I68): |
Stroke-specific codes (I60, I61, I63, I64): |
|||||
|---|---|---|---|---|---|---|
| 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 | 245/390 (62.8) | 244/322 (75.8) | 236/308 (76.6) | 240/345 (69.9) | 239/287 (83.3) | 232/275 (84.4) |
| 2005–2008 | 245/380 (64.5) | 241/351 (68.7) | 231/326 (70.9) | 226/289 (78.2) | 224/271 (82.7) | 214/255 (83.9) |
| 2008–2011 | 282/394 (71.6) | 278/381 (73.0) | 255/339 (75.2) | 270/295 (91.5) | 266/289 (92.0) | 245/268 (91.4) |
| 2011–2014 | 306/418 (73.2) | 300/402 (74.6) | 280/359 (78.0) | 293/323 (90.7) | 288/314 (91.7) | 269/292 (92.1) |
| 2014–2017 | 303/413 (73.4) | 296/384 (77.1) | 271/337 (80.4) | 293/336 (87.2) | 286/318 (89.9) | 261/289 (90.3) |
| ptrend | <0.0001 | 0.198 | 0.041 | <0.0001 | 0.0002 | 0.001 |
| Total | 1381/1995 (69.2) | 1359/1840 (73.9) | 1273/1669 (76.3) | 1322/1588 (83.2) | 1303/1479 (88.2) | 1221/1379 (88.5) |
TP: true positive.