Table 3.
Neuroimaging by modality between time periods and secondary outcomes comparing time periods
| Variable | Control period (N = 1052) n (%) |
rMRI period (N = 1308) n (%) |
Difference in percent (95% CI) | P |
|---|---|---|---|---|
| rMRI | 114 (10.8) | 504 (38.5) | 27.7 (24.4, 31.0) | < 0.01 |
| Head CT | 736 (70.0) | 634 (48.5) | −21.5 (−25.5, −17.5) | < 0.01 |
| Full MRI | 202 (19.2) | 170 (13.0) | −6.2 (−9.3, −3.1) | < 0.01 |
| Time to neuroimaging in minutes; median (IQR) | 119 (64–193) | 139 (84–208) | – | < 0.01 |
| Total ED LOS in minutes; median (IQR) | 304 (231–387) | 304 (232–397) | – | 0.82 |
| Any follow-up neuroimaging within 14 days, n (%) | 130 (12.4) | 169 (12.9) | 0.6 (−2.2, 3.3) | 0.72 |
| Full MRI within 14 days, n (%) | 91 (8.7) | 130 (10.0) | 1.3 (−1.1, 3.7) | 0.36 |
| Time to follow up neuroimaging, n (%) | 0.96 | |||
| 1–2 days | 100 (76.9) | 128 (75.7) | −1.2 (−11.6, 9.2) | |
| 3–7 days | 16 (12.3) | 21 (12.4) | 0.1 (−7.5, 7.8) | |
| 8–14 days | 14 (10.8) | 20 (11.8) | 1.1 (−6.8, 9.0) |
rMRI rapid MRI, CT computerized tomography, MRI magnetic resonance imaging, IQR interquartile range, ED emergency department, LOS length of stay