| Confidence Interval | Length | ||
| Lower | Upper | ||
| 90% CI: | |||
| (a) Single Bootstrap Model | −218.746 | 273.413 | 492.159 |
| (b) Double Bootstrap Model | −191.359 | 267.963 | 459.322 |
| 95% CI: | |||
| (a) Single Bootstrap Model | −223.961 | 268.942 | 492.903 |
| (b) Double Bootstrap Model | −204.077 | 255.372 | 459.449 |