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S-B Scaled χ2 Difference Tests
| Group and model | dfΔ | S-B Scaled χ2Δ | p |
|---|---|---|---|
| Vietnam | |||
| 1–3 | 5 | 1080.14 | <.001 |
| 2a–3 | 1 | 78.23 | <.001 |
| 2b–3 | 1 | 989.84 | <.001 |
| 3–4a | 1 | 109.26 | <.001 |
| Post-Vietnam | |||
| 1–3 | 5 | 341.61 | <.001 |
| 2a–3 | 1 | 44.09 | <.001 |
| 2b–3 | 1 | 33.86 | <.001 |
| 3–4a | 1 | 35.57 | <.001 |
| OEF/OIF Registry | |||
| 1–3 | 5 | 458.8 | <.001 |
| 2a–3 | 1 | 9.58 | .002 |
| 2b–3 | 1 | 17.54 | <.001 |
| 3–4a | 1 | 28.42 | <.001 |
Note. OEF/OIF = Operation Enduring Freedom/Operation Iraqi Freedom.
