1921-26 cohort | 1946-52 cohort | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
Hospital-recorded stroke | Hospital-recorded stroke | |||||||||
Yes | No | Total | Yes | No | Total | |||||
Self-reported stroke | Yes | 25 | 77 | 102 | Self-reported stroke | Yes | 11 | 14 | 25 | |
No | 7 | 1447 | 1454 | No | 3 | 2091 | 2094 | |||
Total | 32 | 1524 | 1556 | Total | 14 | 2105 | 2119 | |||
Agreement measures | ||||||||||
Prevalence (self-report) | 6.6% | 1.2% | ||||||||
Prevalence (hospital-recorded) | 2% | 0.7% | ||||||||
Sensitivity | 78.1% | 78.6% | ||||||||
Specificity | 94.9% | 99.3% | ||||||||
Positive predictive value | 24.5% | 44.0% | ||||||||
Negative predictive value | 99.5% | 99.9% | ||||||||
Kappa (95% CI) | 0.35 (0.25 to 0.46) | 0.56 (0.37 to 0.75) | ||||||||
Prevalence index | 0.91 | 0.98 |