Longitudinal Studies

We can lead you in conducting longitudinal studies.

Philliber often conducts longitudinal studies. We have a long history of high response rates for our studies and consistently maintain response rates of 80% or higher after more than one year of follow up. Philliber is a recognized leader in our field with presentations on how to maintain high response rates presented to the American Public Health Association. Without high response rates, the level of attrition may impact the outcome data or leave the researcher with a group that is an unrepresentative sample.

A few select recent or key longitudinal evaluations include:

Achieving Condom Empowerment (ACE)-Plus, Cicatelli Associates Inc./Office of Population Affairs (formerly the Office of Adolescent Health)

Cicatelli Associates Inc. has been awarded a five year grant from the Office for Adolescent Health to test the effectiveness of Achieving Condom Empowerment (ACE)-Plus, an intervention designed to increase correct and consistent condom use among young males in foster care settings in New York City to help prevent teen pregnancy and improve adolescent health. Philliber is evaluating the implementation and impacts of the program using a random assignment design.

Carrera in Schools (Carrera Social Innovation Fund), Children’s Aid Society/ True North Fund

Children’s Aid Society used a four-year grant from the True North Fund, a partnership of the Edna McConnell Clark Foundation and the Social Innovation Fund, to strengthen and test the effectiveness of the CAS-Carrera in-school program model. This model was one of only nine awarded funds. Philliber used a quasi-experimental design to evaluate the program from 2011 through 2015.

IN•clued: Inclusive Healthcare—Youth and Providers Empowered, Planned Parenthood of the Great Northwest and Hawaiian Islands/Office of Population Affairs (formerly the Office of Adolescent Health)

Planned Parenthood of the Great Northwest and the Hawaiian Islands is implementing and evaluating IN•clued: Inclusive Healthcare—Youth and Providers Empowered, an innovative approach designed specifically for LGBTQ youth to reduce pregnancies and sexually transmitted infections. This project is a randomized control trial reaching approximately 1,800 youth and 300 healthcare professionals in 12 communities over five years. IN•clued is delivered by trained peer educators and includes two components: (1) a three-hour workshop for health care staff and providers that addresses best practices for working with LGBTQ youth, as well as hands-on practice in mock teen-patient interviews; and 2) a 3-hour interactive workshop for LGBTQ youth that includes education related to sexual risk prevention and healthy relationships, and information about how to access sexual health services. Philliber is conducting a randomized control trial of the program.

Linking Families and Teens, Planned Parenthood of the Great Northwest and Hawaiian Islands/Office of Population Affairs (formerly the Office of Adolescent Health)

Linking Families and Teens (LiFT) is an innovative program designed by Planned Parenthood of the Great Northwest and Hawaiian Islands (PPGNHI) for families in rural communities, with the goal of reducing unplanned teen pregnancies by increasing family connectedness and increasing youth’s self-efficacy, knowledge, and skills related to sexual health. LiFT is a two-module curriculum workshop delivered in five hours for youth and their parenting adults. Youth and parenting adults also receive participant guides that encourage communication between them as well as optional weekly texts that offer additional resources and suggestions for fun ways families can communicate for 12 weeks after the workshop. Parenting adults receive a phone call from the facilitator 3 to 5 weeks after the workshop to reinforce the skills learned during the program. Philliber is conducting a random controlled study to measure the impact of this program.

Teen Council RCT, Planned Parenthood of the Great Northwest and Hawaiian Islands

Planned Parenthood of the Great Northwest and the Hawaiian Islands began its peer education program, Teen Council, in 1989. The Teen Council vision is to provide accurate, unbiased, and useful sexuality education; to end ignorance, promote tolerance, and improve communication between teens and the important people in their lives. Philliber has been conducting a longitudinal study of Teen Council program since 2010. In addition, between 2014 and 2019, the Teen Council evaluation began a randomized control trial (RCT) across multiple Planned Parenthood affiliates in an effort to better isolate the effect of the program on Teen Council members. Over the course of five years, 810 teens were enrolled in the impact study.

Teen Outreach Program, Planned Parenthood of the Great Northwest and the Hawaiian Islands/Office of Population Affairs (formerly the Office of Adolescent Health)

Northwest Coalition for Adolescent Health was awarded $20 million by the Office of Adolescent Health to replicate the Teen Outreach Program (TOP), an evidence-based youth development program aimed at reducing teen pregnancy. Services were delivered by a coalition of six Planned Parenthood affiliates in Montana, Oregon, Idaho, Washington, and Alaska at over 50 sites. This project was evaluated using a random assignment design wherein students are assigned to receive TOP or a benign alternative program called Community Voices. Philliber developed a system of evaluation which includes managing and conducting surveys across all sites, analyzing data and ensuring fidelity.

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