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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

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 Table E1.3. Compute the group size and the proportion of subjects in each group who never used condoms.

 

TABLE E1.3

 

Condom Use

Cases

Controls

Never

176

488

Ever

51

186

Aug 02 2020 View more View Less

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