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Summary
| Rank | Name | Nation | Time |
| 1 | Valerie Brisco-Hooks | USA | 48.83 |
| 2 | Chandra Cheeseborough | USA | 49.05 |
| 3 | Kathy Cook | GBR | 49.42 |
| 4 | Marita Payne | CAN | 49.91 |
| 5 | Lillie Leatherwood | USA | 50.25 |
| 6 | Ute Thimm | FRG | 50.37 |
| 7 | Charmaine Crooks | CAN | 50.45 |
| 8 | Ruth Waithera | KEN | 51.56 |