The relationship between prior condom use and tubal pregnancy was assessed in a population-based case-control study at Group Health Cooperative of Puget Sound during 1981 – 1986. The results are shown in the table. Compute the group size and the proportion of subjects in each group who never used condoms.
Condom Use | Cases | Controls |
Never | 176 | 488 |
Always | 51 | 186 |
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