Table 2.

Electronic health record (EHR) identification of potentially eligible participants, study inclusion and exclusion eligibility criteria, recruitment and retention strategies and their modifications over the study period.

	Original Protocol—November 2020	Modification 1—January 2021	Modification 2—July 2021	Modification 3—February 2022
Identification of potentially eligible participants via the EHR	2-6 months post partum AND No current depression diagnosis AND Postpartum PHQ-9 score between 10 and 19 OR Postpartum PHQ-2 score ≥3	N/Aa	2-6 months post partum AND No current depression diagnosis AND Postpartum PHQ-9b score (10-19) OR Postpartum PHQ-2c score ≥3 OR History of depression diagnosis or antidepressant medication use	N/A
Inclusion criteria Ascertained via eligibility screener	PHQ-8d score between 10 and 19 Engages in <30 minutes of regular, moderate/vigorous intensity physical activity per week	PHQ-8 score between 10-19 Engages in <90 minutes per week of regular, moderate/vigorous intensity physical activity per week	Clarification of what is meant by moderate/vigorous intensity physical activity in eligibility screener	N/A
Exclusion Criteria Ascertained via eligibility screener	Not current Kaiser Permanente member <18 years of age Does not own a smartphone, computer, or TV with internet access Has a heart condition and a physician recommending medically supervised physical activity Has chest pain during physical activity or chest pain within the prior month Takes medication for hypertension or a heart condition Diagnosed with depression or received treatment for depression (eg, taken antidepressant medications or received psychotherapy) since giving birth Tendency to fall due to syncope or dizziness Has orthopedic problems that might be aggravated by physical activity Has exercise-induced asthma Is currently pregnant or is planning to become pregnant in the next 3 months Baby weighs outside 11-22 lbs Baby has a chronic illness/disorder that prevent them from being held or lifted up	N/A	N/A	N/A
Recruitment	Recruitment email followed up by recruitment phone call to provide opportunity to discuss the study DOBe authentication by participants to enter survey Study hotline and email to respond to participant communication	N/A	Recruitment letter mailed first Recruitment email Recruitment phone calls made when recruiter time available Removed DOB authentication due to technical issues—recruiter confirms identity over phone Study website	N/A
Retention	Reminder phone calls to wear and send back activity monitor Financial incentive for completion of each assessment (US $70.00 in total) Recognizable logo and culturally competent and sensitive material	N/A	Information added to email for participants emphasizing the importance of contributions and survey completion for all participants, regardless of study group Study gift - Notepad with logo sent at 3 months Study newsletters with information on postpartum topics between study surveys Reminder emails/texts about follow-up surveys One reminder email/text 1 week after randomization to log in to MomZing in intervention group	Shorter, limited surveys, only including primary outcomes were available Additional reminders (text/email) were sent to intervention group for using MomZing

^aN/A: not applicable.

^bPHQ-9: Patient Health Questionnaire-9.

^cPHQ-2: Patient Health Questionnaire-2.

^dPHQ-8: Patient Health Questionnaire-8.

^eDOB: Date of birth.