Table 2. Sensitivity, specificity, positive predictive value (PPV) and level of agreement (κ) for stroke diagnosis.
| Sensitivity, % (95% CI) | Specificity, % (95% CI) | PPV, % (95% CI) | κ (95% CI) | |
|---|---|---|---|---|
| JNUH | ||||
| Algorithm 1: using all diagnoses | ||||
| IS (n=461) | 97 (95-98) | 88 (85-91) | 88 (84-90) | 0.84 (0.81-0.87) |
| ICH (n=126) | 92 (86-96) | 96 (95-97) | 78 (71-85) | 0.82 (0.77-0.87) |
| SAH (n=63) | 91 (80-96) | 98 (97-99) | 78 (67-87) | 0.83 (0.76-0.90) |
| Overall κ | 0.81 (0.80-0.83) | |||
| Algorithm 2: using one primary diagnosis and one secondary diagnosis | ||||
| IS (n=461) | 92 (89-95) | 91 (88-93) | 90 (86-92) | 0.83 (0.79-0.86) |
| ICH (n=126) | 73 (65-81) | 98 (97-99) | 85 (77-91) | 0.76 (0.69-0.82) |
| SAH (n=63) | 87 (77-94) | 99 (98-99) | 81 (70-89) | 0.83 (0.76-0.90) |
| Overall κ | 0.80 (0.77-0.81) | |||
| Algorithm 3: using only one primary diagnosis | ||||
| IS (n=461) | 67 (62-71) | 97 (95-98) | 95 (92-97) | 0.65 (0.60-0.69) |
| ICH (n=126) | 60 (51-69) | 99 (98-100) | 91 (83-96) | 0.69 (0.62-0.76) |
| SAH (n=63) | 73 (60-83) | 99 (98-100) | 85 (73-93) | 0.77 (0.69-0.86) |
| Overall κ | 0.62 (0.60-0.63) | |||
| SMC | ||||
| Algorithm 1: using all diagnoses | ||||
| IS (n=507) | 96 (93-97) | 68 (63-73) | 82 (79-85) | 0.67 (0.61-0.72) |
| ICH (n=145) | 97 (92-99) | 98 (96-99) | 90 (84-94) | 0.92 (0.88-0.95) |
| SAH (n=50) | 98 (89-100) | 99 (98-100) | 88 (76-95) | 0.92 (0.86-0.98) |
| Overall κ | 0.65 (0.62-0.68) | |||
| Algorithm 2: using one primary diagnosis and one secondary diagnosis | ||||
| IS (n=507) | 86 (83-89) | 77 (72-81) | 85 (82-88) | 0.64 (0.58-0.69) |
| ICH (n=145) | 92 (86-95) | 98 (97-99) | 90 (85-94) | 0.89 (0.85-0.93) |
| SAH (n=50) | 98 (94-100) | 99 (99-100) | 91 (83-98) | 0.94 (0.89-0.98) |
| Overall κ | 0.63 (0.60-0.64) | |||
| Algorithm 3: using only one primary diagnosis | ||||
| IS (n=507) | 83 (79-86) | 84 (80-88) | 89 (86-92) | 0.66 (0.61-0.71) |
| ICH (n=145) | 85 (78-90) | 99 (97-99) | 92 (87-96) | 0.86 (0.82-0.91) |
| SAH (n=50) | 90 (78-96) | 99 (98-100) | 87 (74-94) | 0.88 (0.81-0.95) |
| Overall κ | 0.65 (0.64-0.69) | |||
CI: confidence interval, ICH: intracranial hemorrhage, IS: ischemic stroke, JNUH: Jeju National University Hospital, SAH: subarachnoid hemorrhage, SMC: Seoul Medical Center.