| Characteristic | Odds ratio 95% CI (lower to upper) | p Value |
| Clinician type | ||
| Staff | 1.00 (1.00 to 1.00) | 0.246 |
| Clinician | 1.45 (0.82 to 2.56) | |
| Race | ||
| White, not Hispanic | 1.00 (1.00 to 1.00) | 0.066 |
| All others | 2.27 (1.09 to 4.73) | |
| Error type* | ||
| Test ordering | 1.00 (1.00 to 1.00) | <0.001 |
| Administration | 0.65 (0.21 to 2.00) | |
| Test implementation | 5.32(2.22 to 12.76) | |
| Reporting results to the clinician | 0.89 (0.34 to 2.27) | |
| Clinician responding to the results | 0.66 (0.15 to 2.85) | |
| Notifying the patient of results | 3.55 (1.19 to 10.63) | |
| Other errors* | 3.37 (1.23 to 9.20) | |
| Quality of office system for follow-up of abnormal test results | ||
| Low quality† | 1.00 (1.00 to 1.00) | 0.872 |
| High quality‡ | 0.92 (0.34 to 2.50) |
*Other errors category combined communication errors with process errors.
†Less than 95% of patients are directly notified of significant abnormal lab results, and the practice does not have a specific system to ensure testing follow-up.
‡More than 95% of patients are directly notified of significant abnormal lab results, and the practice does have a specific system to ensure testing follow-up.