TABLE 4. Contraceptive efficacy of cervical spermicides.
| Date | Country | No. Women | Pregnancy Rate (%) | Remarks |
| 1971 | USA | 2932 | 4.0 | foam |
| 1972 | Japan | 587 | 3.2 | foaming tablet |
| 1973 | USA | 474 | 31.0 | foam |
| 1977 | Germany | 1652 | 0.3 | foaming suppository |
| 1980 | Bangladesh | 150 | 6.5 | foaming tablet |
| 1982 | USA | 613 | 17.9 | foam, cream, jelly |