Table 2 Accuracy of different approximations.
| Absolute difference between approximation and actual weight | Mean (SD) (kg) | Mean (SD) (%) | Proportion of patients with >10% mismatch of weight approximation (%) | Proportion of patients with ⩾5 mg hypothetical rt‐PA dosage failure (%) |
|---|---|---|---|---|
| Estimation physician 1 | 6.49 (5.25) | 8.6 (6.9) | 32.0 | 48.3 |
| Estimation physician 2 | 7.43 (5.73) | 9.7 (7.7) | 40.7 | 53.9 |
| Best estimation of two physicians | 4.54 (3.88) | 6.0 (5.1) | 15.2 | 28.1 |
| Anthropometric approximation, linear formula with 3 parameters plus gender (model 1) | 3.11 (2.60) | 4.2 (3.7) | 6.2 | 14.6 |
| Anthropometric approximation, linear formula with 3 parameters plus gender (model 1), calculated with the nomogram (fig 2) | 3.11 (2.69) | 4.2 (3.6) | 7.3 | 14.6 |
| Anthropometric approximation, linear formula with 4 parameters plus gender (model 2) | 3.19 (2.57) | 4.3 (3.8) | 6.7 | 14.0 |
| Anthropometric approximation, formula with 4 parameters plus gender with inclusion of transformed parameters (model 3) | 3.73 (3.08) | 5.0 (4.8) | 7.3 | 20.8 |
| Patient's own estimation | 2.65 (2.37) | 3.4 (3.0) | 3.4 | 23.6 |
rt‐PA, recombinant tissue plasminogen activator.