Introduction and Background. Minorities are less likely to reportrapes. The Post Coital DNA Recovery (PCDR) study (2009-14) subjects were white(93%) where expanded collection times were not generalizable to minoritypopulations. Evidence reports health and medical differences between racesnecessitating duplication of previous research in minority populations.Aims.(1) What is the time period in which it ispossible to collect post-coital DNA in minority women using Y-STR laboratorymethods? and (2) when compared to the former study sample of minority andnon-minority, what are the physiological conditions, factors, or activities inminority couples that influence post-coital DNA recovery?Design. The design includes mixed methods duplicationperfected in the first study, embracing descriptive and inferential techniques.Qualitative research used semi-structured interviews. Aim 1 analysis used PCDR-Mdata only. Aim 2 combined data from both PCDR and PCDR-M studies. Combined, DNArecovery, a binary outcome accounting for repeated methods in populationregression analysis, used Generalized Estimating Equation (GEE) methods.Fidelity.The strict criteria for adherence included considerable outreach andsupport of study personnel. PCDR and PCDR-M data combined and compared the twosamples, which had specific homogeneity, including same inclusion andelimination criteria in both studies; fidelity to the validated protocol;laboratory method and interpretation for inclusion; duplicate statisticalanalysis; and interpretation of data. Any variation in key variables metelimination criteria.Assumptions and Limitations. Assumptions included (1) motivation is altruistic; (2)motivation is incentives and coercion for some; (3) negotiating coitus isdifficult and stressful; and (4) similar fidelity and dropout rates. Thelimitations included (1) a lack of representation for the diverse experiencesof rape victims; (2) sample size; (3) self-selection bias; (4) protocol adherence;and (4) advances in laboratory science and DNA kits.Demographics. Demographic variables included gender, race, and age. Major categories in the dataset included participants' reproductive history, data on female participants' reproductive organs, and childhood abuse.

Introduction and Background. Minorities are less likely to reportrapes. The Post Coital DNA Recovery (PCDR) study (2009-14) subjects were white(93%) where expanded collection times were not generalizable to minoritypopulations. Evidence reports health and medical differences between racesnecessitating duplication of previous research in minority populations.Aims.(1) What is the time period in which it ispossible to collect post-coital DNA in minority women using Y-STR laboratorymethods? and (2) when compared to the former study sample of minority andnon-minority, what are the physiological conditions, factors, or activities inminority couples that influence post-coital DNA recovery?Design. The design includes mixed methods duplicationperfected in the first study, embracing descriptive and inferential techniques.Qualitative research used semi-structured interviews. Aim 1 analysis used PCDR-Mdata only. Aim 2 combined data from both PCDR and PCDR-M studies. Combined, DNArecovery, a binary outcome accounting for repeated methods in populationregression analysis, used Generalized Estimating Equation (GEE) methods.Fidelity.The strict criteria for adherence included considerable outreach andsupport of study personnel. PCDR and PCDR-M data combined and compared the twosamples, which had specific homogeneity, including same inclusion andelimination criteria in both studies; fidelity to the validated protocol;laboratory method and interpretation for inclusion; duplicate statisticalanalysis; and interpretation of data. Any variation in key variables metelimination criteria.Assumptions and Limitations. Assumptions included (1) motivation is altruistic; (2)motivation is incentives and coercion for some; (3) negotiating coitus isdifficult and stressful; and (4) similar fidelity and dropout rates. Thelimitations included (1) a lack of representation for the diverse experiencesof rape victims; (2) sample size; (3) self-selection bias; (4) protocol adherence;and (4) advances in laboratory science and DNA kits.Demographics. Demographic variables included gender, race, and age. Major categories in the dataset included participants' reproductive history, data on female participants' reproductive organs, and childhood abuse.