TABLE 2.
Measures of agreement between self‐reported vaccination status and documented vaccination status for the five to six influenza seasons preceding interview among participating healthcare personnel (N = 683)—2018–2019 to 2019–2020
| Influenza season | Able to self‐report influenza vaccine status | Self‐reported vaccination status | Documented vaccination status | Absolute difference a | Prevalence‐adjusted kappa coefficient b | Sensitivity | Specificity | Positive predictive value | Negative predictive value | |
|---|---|---|---|---|---|---|---|---|---|---|
| N | % | % (95% CI) | % (95% CI) | % | Coeff. (95% CI) | Value (95% CI) | Value (95% CI) | Value (95% CI) | Value (95% CI) | |
| All sites (N = 683) | ||||||||||
| Preceding season | 613 | 89.7 | 97.1 | 97.9 | −0.8 | 90.5 (87.2, 93.9) | 97.2 (95.5, 98.3) | 7.7 (0.2, 36.0) | 98.0 (97.7, 98.3) | 5.6 (0.8, 29.1) |
| 2 seasons prior | 611 | 89.5 | 99.5 | 92.8 | 6.7 | 86.6 (82.6, 90.5) | 100 (99.3, 100) | 6.8 (1.4, 18.7) | 93.3 (92.7, 93.7) | — c |
| 3 seasons prior | 599 | 87.7 | 98.2 | 95.3 | 2.9 | 90.3 (86.9, 93.7) | 98.9 (97.7, 99.6) | 17.9 (6.1, 36.9) | 96.1 (95.4, 96.7) | 45.5 (21.3, 72.0) |
| 4 seasons prior | 584 | 85.5 | 98.1 | 92.5 | 5.6 | 86.0 (81.8, 90.1) | 99.3 (98.1, 99.8) | 15.9 (6.6, 30.1) | 93.5 (92.7, 94.3) | 63.6 (34.7, 85.2) |
| 5 seasons prior | 564 | 82.6 | 96.8 | 89.5 | 7.3 | 81.9 (77.2, 86.7) | 99.0 (97.7, 99.7) | 22.0 (12.3, 34.7) | 91.6 (90.5, 92.6) | 72.2 (49.0, 87.6) |
| 6 seasons prior d | 108 | 73.5 | 91.7 | 86.1 | 5.6 | 81.5 (70.5, 92.4) | 97.9 (92.5, 99.7) | 46.7 (21.3, 73.4) | 91.9 (87.6, 94.8) | 77.8 (44.5, 93.9) |
| Baylor Scott & White Health System (N = 318) | ||||||||||
| Preceding season | 276 | 86.8 | 96.7 | 96.4 | 0.3 | 93.1 (89.5, 95.8) | 96.6 (93.7, 98.4) | — c | — c | — c |
| 2 seasons prior | 275 | 86.5 | 100 | 89.1 | 10.9 | 95.3 (92.0, 97.6) | 100 (98.5, 100) | — c | — c | — c |
| 3 seasons prior | 271 | 85.2 | 99.3 | 93.0 | 6.3 | 84.5 (78.1, 90.9) | 99.2 (97.2, 99.9) | — c | 92.9 (89.3, 95.7) | — c |
| 4 seasons prior | 265 | 83.3 | 99.3 | 89.1 | 10.2 | 78.1 (70.6, 85.6) | 99.6 (97.7, 100) | — c | 89.3 (88.7, 90.0) | — c |
| 5 seasons prior | 259 | 81.5 | 98.8 | 88.0 | 10.8 | 73.7 (65.5, 82.0) | 98.7 (96.2, 99.7) | — c | 87.9 (87.7, 89.1) | — c |
| Kaiser Permanente Northwest (N = 365) | ||||||||||
| Preceding season | 337 | 92.3 | 97.3 | 99.1 | −1.8 | 94.1 (90.4, 97.7) | 97.6 (95.3, 99.0) | — | 99.4 (98.7, 99.7) | 11.1 (2.1, 41.6) |
| 2 seasons prior | 336 | 92.1 | 99.1 | 95.8 | 3.3 | 93.5 (89.7, 97.3) | 100 (98.9, 100) | — | 96.7 (95.7, 97.5) | — c |
| 3 seasons prior | 328 | 89.9 | 97.3 | 97.3 | 0 | 95.1 (91.8, 98.5) | 98.7 (96.8, 99.7) | 55.6 (21.2, 86.3) | 98.7 (97.4, 99.4) | 55.6 (28.7, 79.6) |
| 4 seasons prior | 319 | 87.4 | 97.2 | 95.3 | 1.9 | 92.5 (88.3, 96.7) | 99.0 (97.1, 99.8) | 40.0 (16.3, 67.7) | 97.1 (95.7, 98.1) | 66.7 (35.6, 87.9) |
| 5 seasons prior | 305 | 83.6 | 95.1 | 90.8 | 4.3 | 88.9 (83.7, 94.0) | 99.3 (97.4, 99.9) | 46.4 (27.5, 66.1) | 94.8 (92.8, 96.3) | 86.7 (60.7, 96.5) |
a
Absolute difference in self‐reported vaccination status versus documented vaccination status.
b
Kappa coefficient showing percent agreement between self‐reported and documented influenza vaccination status.
c
Unable to estimate based on small numbers (n < 2).
d
Information on the sixth preceding season was available for 147 participants recruited in Year 2.