Arpaporn PowwattanaPimrat ThammaraksaSroy ManoraBangkok Hospital Medical CenterMahidol UniversityBoromarajonani College of Nursing2019-08-282019-08-282018-06-01Nursing and Health Sciences. Vol.20, No.2 (2018), 214-22314422018144107452-s2.0-85041591681https://repository.li.mahidol.ac.th/handle/20.500.14594/47282© 2018 John Wiley & Sons Australia, Ltd Teenage pregnancy-prevention interventions have fallen short in significantly decreasing risk of pregnancy for Thai populations. The “breaking the voice” (“rak luk khun tong pood”) culture-appropriate teenage pregnancy-prevention program was developed using community-based research. Qualitative analyses of focus group data identified salient factors related to sexual communication and behavior. The integration of focus group results with theoretical constructs guided the development of an intervention to reduce risky sexual behavior by increasing communication between mothers and their adolescent daughters. A total of 157 mother–daughter dyads from congested areas in Bangkok participated in pilot testing of the intervention by the use of a survey. The findings indicated a significant increase in the frequency of and number of sexual risk communication (P <.05). There was a significant increase in perceived power in relationship control, ability to prevent sexual risk, assertiveness, and ability to decrease sexual risk among daughters (P <.05). “Breaking the voice” represents a female-focused and culturally-relevant intervention to combat teenage pregnancy.Mahidol UniversityNursingArticleSCOPUS10.1111/nhs.12404