Table 4.
Time trends of the accuracy of hospital discharge codes in identifying true acute haemorrhagic stroke cases (positive predictive value) stratified by searching strategies.
|
Intracerebral haemorrhage (I61) |
Subarachnoid haemorrhage (I60) |
|||||
|---|---|---|---|---|---|---|
| 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 | 15/29 (51.7) | 15/28 (53.6) | 15/28 (53.6) | 17/33 (51.5) | 17/25 (68.0) | 16/21 (76.2) |
| 2005–2008 | 25/39 (64.1) | 25/35 (71.4) | 24/33 (72.7) | 15/24 (62.5) | 15/23 (65.2) | 15/18 (83.3) |
| 2008–2011 | 40/48 (83.3) | 39/46 (84.8) | 37/43 (86.0) | 11/15 (73.3) | 11/15 (73.3) | 11/15 (73.3) |
| 2011–2014 | 38/45 (84.4) | 36/43 (83.7) | 35/42 (83.3) | 11/16 (68.8) | 11/15 (73.3) | 10/14 (71.4) |
| 2014–2017 | 50/59 (84.7) | 49/53 (92.5) | 43/47 (91.5) | 15/28 (53.6) | 15/27 (55.6) | 15/26 (57.7) |
| ptrend | 0.0002 | <0.0001 | 0.0001 | 0.74 | 0.47 | 0.09 |
| Total | 168/220 (76.4) | 164/205 (80.0) | 154/193 (79.8) | 69/116 (59.5) | 69/105 (65.7) | 67/94 (71.3) |
TP: true positive cases.