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The relationship between prior condom use and tubal pregnancy was assessed in a population-based case-control study...

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
Math   Statistics-And-Probability   
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