Median cost (IQR) (US$) and frequency of errors by usage patterns
| Were unnecessary services ordered? | |||
| No | Yes | ||
| Were necessary services missed? | No | Appropriate care (n=146): 0 (0, 0) | Overuse (n=34): 83 (61, 266) |
| Yes | Underuse (n=178): 194 (30, 799) | Misuse (n=41): 160 (113, 725) | |