Short-Term Impacts of Pulse: An App-Based Teen Pregnancy Prevention Program for Black and Latinx Women.

Black and Latinx women aged 18-20 years have high rates of unplanned pregnancy. Furthermore, this age group is less likely than school-aged youth to be served by pregnancy prevention programs typically administered in schools. The study's purpose was to assess the effectiveness of a new app-based teen pregnancy prevention program created for this population using an online- and texting-only recruitment and evaluation approach. The study design was a randomized controlled trial with individual-level assignment of 1,304 women aged 18-20 years recruited online. Seventy-six percent of participants were black or Latinx. Women were randomized to the Pulse reproductive health app or a general health app and received regular text messages with program content and reminders to view the app. An intention-to-treat approach was used for analyses, and significance tests were adjusted to account for permuted block random assignment and multiple hypothesis testing. Linear probability models controlling for the baseline measure of each outcome, whether the participant reported ever having vaginal sex, age, and race/ethnicity, assessed program impacts for 1,124 participants 6 weeks after randomization. Participants who received the intervention were 7.6 percentage points less likely (p = .001) to report having had sex without a hormonal or long-acting contraceptive method. Intervention participants also scored 7.1 percentage points higher on contraceptive knowledge (p = .000) and were 5.7 percentage points more likely to be confident that they can use birth control during every sexual intercourse (p = .027). Impacts at 6 weeks are promising, particularly for a self-led intervention with no direct contact with study staff.

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