|
Inter-rater reliability for stroke sub-type, demographic, clinical features, and pre-hospital data. |
|||||
| Variable (Item Number) |
Dichotomous response option |
N |
PI* |
Kappa (95% LCL)† |
BI‡ |
|
|
|||||
| Coverdell stroke sub-type (1.0) |
Ischemic Stroke |
104 |
0.24 |
0.61 (0.46) |
-0.07 |
| Intracranial hemorrhage (ICH) |
104 |
-0.86 |
0.93 (0.79) |
0.01 |
|
| Subarachnoid hemorrhage (SAH) |
104 |
-0.89 |
0.90 (0.72) |
0.01 |
|
| Transient ischemic attack (TIA) |
104 |
-0.64 |
0.70 (0.52) |
-0.01 |
|
| Gender (1.2) |
Female |
104 |
0.16 |
0.98 (0.94) |
0.01 |
| Race (1.3) |
White |
104 |
0.40 |
0.55 (0.38) |
0.13 |
| Black or African American |
104 |
-0.66 |
0.97 (0.90) |
0.01 |
|
| Not documented (missing) |
104 |
-0.76 |
0.07 (-0.13) |
-0.11 |
|
| Health Insurance status (1.7) |
Medicare |
104 |
0.43 |
0.83 (0.72) |
0.03 |
| Medicaid |
104 |
-0.86 |
0.50 (0.18) |
- 0.03 |
|
| Self-pay |
104 |
-0.89 |
0.52 (0.15) |
0.01 |
|
| Arrival mode (2.2) |
Ambulance |
104 |
-0.40 |
0.82 (0.69) |
0.00 |
| Other |
104 |
-0.14 |
0.59 (0.43) |
-0.01 |
|
| Hospital transfer |
104 |
-0.74 |
0.70 (0.50) |
0.03 |
|
| Not documented (missing) |
104 |
-0.72 |
0.40 (0.15) |
-0.01 |
|
| Direct admit (2.2b) |
Yes |
98 |
-0.88 |
0.47 (0.17) |
0.04 |
|
* Prevalence Index (PI) is a measure of the true prevalence of the trait. PI is 0 when concordant responses are equally balanced between the 2 raters. A large negative PI indicates trait is rarely found, while a large positive PI indicates trait is common. Variables with extreme distributions i.e., PI < -0.90 or > 0.90 are not shown. † 95% LCL = 95% Lower Confidence Limit. ‡ Bias Index (BI) is a measure of the relative bias between the hospital and audit abstractors. BI is 0 when there is no bias. Positive BI values indicate a bias toward the hospital abstractor, negative BI values indicates a bias towards the audit abstracter. BI values > 0.10 or < -0.10 indicate substantial bias. | |||||
Reeves et al. BMC Neurology 2008 8:19 doi:10.1186/1471-2377-8-19 |
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