| Characteristic | Odds ratio 95% CI (lower to upper) | p Value |
| Clinician type | ||
| Staff | 1.00 (1.00 to 1.00) | 0.108 |
| Clinician | 1.64 (0.97 to 2.77) | |
| Age category | ||
| 0–17 years | 1.00 (1.00 to 1.00) | 0.200 |
| 18–44 years | 1.91 (0.66 to 5.53) | |
| 45–64 years | 3.07 (1.06 to 8.93) | |
| ⩾65 | 2.27 (0.77 to 6.65) | |
| Race | ||
| White, not Hispanic | 1.00 (1.00 to 1.00) | 0.035 |
| All others | 3.07 (1.32 to 7.14) | |
| Error type | ||
| Test ordering | 1.00 (1.00 to 1.00) | 0.041 |
| Administration | 0.80 (0.35 to 1.85) | |
| Test implementation | 4.18 (1.64 to 10.67) | |
| Reporting results to the clinician | 1.11 (0.54 to 2.29) | |
| Clinician responding to the results | 1.41 (0.44 to 4.48) | |
| Notifying the patient of results | 2.54 (0.70 to 9.30) | |
| Other errors* | 1.53 (0.56 to 4.16) | |
| Quality of office system for follow-up of abnormal test results | ||
| Low quality† | 1.00 (1.00 to 1.00) | 0.995 |
| High quality‡ | 1.00 (0.31 to 3.17) |
*Includes “communication errors” and “other process errors,” combined because of the small sample size.
†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.