Validity of self-reported stroke in participants aged 30 and 36–79 years by ethnicity, sex, age and education. The SAMINOR 1 Survey (2003–2004) and the CVDNOR project, n=15 088.
| PAS† | Sensitivity | Specificity | PPV | NPV | κ | |||
|---|---|---|---|---|---|---|---|---|
| Self-reported stroke | Yes | No | (95% CI) | (95% CI) | (95% CI) | (95% CI) | (95% CI) | |
| Total | ||||||||
| Yes | 142 | 79 | 81.1% | 99.5% | 64.3% | 99.8% | 0.71 | |
| No | 33 | 14 834 | (74.5 to 86.6) | (99.3 to 99.6) | (57.6 to 70.6) | (99.7 to 99.9) | (0.66 to 0.76) | |
| Ethnicity‡ | ||||||||
| Sami | Yes | 50 | 25 | 79.4% | 99.5% | 66.7% | 99.7% | 0.72 |
| No | 13 | 4894 | (67.3 to 88.5) | (99.3 to 99.7) | (54.8 to 77.1) | (99.5 to 99.9) | (0.64 to 0.81) | |
| Non-Sami§ | Yes | 90 | 52 | 84.1% | 99.5% | 63.4% | 99.8% | 0.72 |
| No | 17 | 9459 | (75.8 to 90.5) | (99.3 to 99.6) | (54.9 to 71.3) | (99.7 to 99.9) | (0.66 to 0.78) | |
| Sex | ||||||||
| Women | Yes | 58 | 38 | 84.1% | 99.5% | 60.4% | 99.9%* | 0.70 |
| No | 11 | 7760 | (73.3 to 91.8) | (99.3 to 99.7) | (49.9 to 70.3) | (99.7 to 99.9) | (0.62 to 0.78) | |
| Men | Yes | 84 | 41 | 79.2% | 99.4% | 67.2% | 99.7% | 0.72 |
| No | 22 | 7074 | (70.3 to 86.5) | (99.2 to 99.6) | (58.2 to 75.3) | (99.5 to 99.8) | (0.66 to 0.79) | |
| Age | ||||||||
| 30–59 years | Yes | 54 | 25 | 87.1% | 99.8%* | 68.4% | 99.9%* | 0.76** |
| No | 8 | 10 274 | (76.1 to 94.3) | (99.6 to 99.8) | (56.9 to 78.4) | (99.8 to 100) | (0.69 to 0.84) | |
| 60–79 years | Yes | 88 | 54 | 77.9% | 98.8% | 62.0% | 99.5% | 0.68 |
| No | 25 | 4560 | (69.1 to 85.1) | (98.5 to 99.1) | (53.5 to 70.0) | (99.2 to 99.6) | (0.62 to 0.75) | |
| Education¶ | ||||||||
| 0–11 years | Yes | 91 | 63 | 77.8% | 99.2%* | 59.1%* | 99.7%* | 0.67** |
| No | 26 | 7854 | (69.2 to 84.9) | (99.0 to 99.4) | (50.9 to 66.9) | (99.5 to 99.8) | (0.60 to 0.73) | |
| ≥12 years | Yes | 27 | 6 | 84.4% | 99.9% | 81.8% | 99.9% | 0.83 |
| No | 5 | 6143 | (67.2 to 94.7) | (99.8 to 100) | (64.5 to 93.0) | (99.8 to 100) | (0.73 to 0.93) | |
*p<0.05, column-specific Pearson's χ2 test for difference between the two categories of each variable. **p<0.05, test for difference in κ statistics between the two categories of each variable:
.†Includes primary or secondary discharge diagnoses of ICD-9: 430, 431, 434, 436; ICD-10: I60, I61, I63, I64 from the PAS of all Norwegian somatic hospitals from 1994 through SAMINOR 1 attendance.
‡Smaller n due to missing values: n=488.
§No Sami identity marks reported.
¶Smaller n due to missing values: n=873.
CVDNOR, Cardiovascular Disease in Norway; ICD-9, International Classification of Diseases, Ninth Revision; ICD-10, International Classification of Diseases, Tenth Revision; NPV, negative predictive value; PAS, Patient Administrative Systems; PPV, positive predictive value.
