Number of CDR-positive (+) children* and number of CDR+ children actually imaged (n=973)
| CDR | Number CDR+ | Percentage CDR+ (95% CI) | Number of CDR+ children imaged in our cohort (%) |
| NEXUS | 430 | 44.2 (41.0 to 47.4) | 325/430 (75.6%) |
| PECARN | 663 | 68.1 (65.1 to 71.1) | 359/663 (54%) |
| CCR† | 472 | 48.4 (45.3 to 51.7) | 236/472 (50%) |
*CDR positive includes only those variables definitively recorded as present (excludes unknowns) to ensure rates are not overestimated.
†For reasons discussed in the ‘Methods’ section, CCR positivity is more difficult to interpret and only a minimum number can be calculated.
CCR, Canadian C-spine Rule; CDR, clinical decision rule; NEXUS, National Emergency X-Radiography Utilization Study Low Risk Criteria; PECARN, Pediatric Emergency Care Applied Research Network.