Center M Randomized Trial

The study is a randomized control trial (RCT) with two parallel arms, 1) an intervention arm: Center M added to treatment as usual (TAU), defined as standard prenatal care, and 2) a control arm: TAU, again defined as standard prenatal care. As both groups will be obtaining services through the Center for Women's Health at OHSU, offered standard prenatal care is expected to be similar in both arms. The study will be masked to the PI, Co-I's, consultants, and anyone directly collecting or analyzing study data. Primary prenatal care providers will also be masked to subject assignment. Participant and interventionist masking is not possible due to the nature of the intervention arm. The research coordinator(s), research assistants needing to communicate with research participants about group activities (e.g., responding to logistical emails), and volunteers who support the research coordinator or research assistants with communications regarding groups will also be unmasked. Participants will be randomized by the research coordinator or designated research assistant after eligibility determination and study consent.

The Center M intervention proceeds sequentially with weekly one-hour group sessions led by a trained, masters-level (or equivalent) therapist. Each group will include 3-6 participants. These sessions are conducted digitally via WebEx. Center M session structure aligns with mindfulness based cognitive therapy by including: 1) introduction of a core theme and rationale for how this theme relates to mental well-being (i.e., psychoeducation); 2) teaching core mindfulness (including an emphasis on self-compassion) and CBT skills; 3) facilitating in-session practice of skills (i.e., experiential learning); and 4) reviewing home practice of skills as well as barriers to practice. Sessions are focused on skill development, both through active engagement in practice during group sessions and individual home practice. Center M content teaches skills that increase capability for effectively navigating general life stress and the unique stresses of pregnancy and parenting. It is further designed to increase awareness of early warning signs of perinatal depression to allow for identification of the need for additional resources (including more intensive preventive intervention). The curriculum is designed to be a 'light touch', or minimum necessary intervention that still retains the capacity to prevent perinatal depression. Examples and summaries of the curriculum and accompanying handouts and homework are outlined below and full curriculum, handouts, and homework are available in the IRB documents. The Center M curriculum, handouts and homework follows the parent model MBCT curriculum, with alterations made in direct communication with Sona Dimidjian, PhD, and Sherryl Goodman, PhD, the developers of the parent model. The Center M adaptation has been accomplished with the support and involvement of Drs. Dimidjian and Goodman.

• Change in EPDS scores (baseline to 3 months) [Time frame: Difference between baseline and 3 months postpartum]
• Change in PHQ scores (baseline to 3 months) [Time frame: Difference between baseline and 3 months postpartum]
• Change in Mindfulness [Time frame: Compared between baseline and following the 4 week intervention, between 30 and 38 weeks of gestation.]
• Change in Emotional Regulation [Time frame: Compared between baseline and following the 4 week intervention, between 30 and 38 weeks of gestation.]