Table 2 Comparison of classification methods for estimating BSI rate and difference in adjusted rates with 10% identifier error (simulated datasets 10-12)
From: Evaluating bias due to data linkage error in electronic healthcare records
Classification | N Infections | Crude rate (95% CI) | Standard error | % bias | Difference in adjusted rates (95% CI) | Standard error | % bias |
|---|---|---|---|---|---|---|---|
Gold standard | 1000 | 18.24 | 0.577 | 5.514 | 1.214 | ||
10: Random error | |||||||
HW | 869 | 15.84 (14.79, 16.90) | 0.646 | -13.1 | 4.55 (2.33, 6.76) | 1.129 | -17.5 |
PII MPD = 0.1 | 1038 | 18.94 (17.67, 20.21) | 0.646 | 3.8 | 5.32 (2.75, 7.89) | 1.313 | -3.5 |
PII MPD = 0.9 | 860 | 15.69 (14.61, 16.77) | 0.551 | -14.0 | 4.45 (2.18, 6.72) | 1.160 | -19.3 |
11: Non-random error; by covariate | |||||||
HW | 886 | 16.15 (15.09, 17.21) | 0.543 | -11.4 | 10.93 (8.61, 13.24) | 1.183 | 98.2 |
PII MPD = 0.1 | 1010 | 18.41 (17.21, 19.62) | 0.614 | 1.0 | 11.69 (9.12, 14.26) | 1.311 | 111.9 |
PII MPD = 0.9 | 858 | 15.65 (14.57, 16.72) | 0.548 | -14.2 | 11.454 (9.09, 13.82) | 1.208 | 107.7 |
12: Non-random error; by outcome | |||||||
HW | 364 | 6.65 (5.98, 7.32) | 0.343 | -63.6 | 1.94 (0.53, 3.35) | 0.720 | -64.9 |
PII MPD = 0.1 | 684 | 12.48 (10.87, 14.09) | 0.822 | -31.6 | 3.36 (0.51, 6.20) | 1.453 | -39.1 |
PII MPD = 0.9 | 217 | 3.95 (3.39, 4.51) | 0.287 | -78.3 | 1.20 (0.00, 2.39) | 0.610 | -78.3 |