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Summary
Semi-final 1
| Rank | Name | Nation | Time |
| 1 | Valerie Brisco-Hooks | USA | 51.14 |
| 2 | Kathy Cook | GBR | 51.49 |
| 3 | Charmaine Crooks | CAN | 51.53 |
| 4 | Ruth Waithera | KEN | 52.21 |
| 5 | June Griffith | GUY | 52.39 |
| 6 | Cathy Rattray | JAM | 53.23 |
| 7 | Marie Lande Mathieu | PUR | 53.69 |
| Did not start | |||
| Gaby Bussmann | FRG | ||
| Rank | Name | Nation | Time |
| 1 | Chandra Cheeseborough | USA | 50.32 |
| 2 | Lillie Leatherwood | USA | 50.83 |
| 3 | Marita Payne | CAN | 50.94 |
| 4 | Ute Thimm | FRG | 51.03 |
| 5 | Molly Killingbeck | CAN | 51.72 |
| 6 | Michelle Scutt | GBR | 52.07 |
| 7 | Ilrey Oliver | JAM | 52.14 |
| 8 | Helen Barnett | GBR | 52.26 |