Table 1 Data items for data extraction

Study methods

 Study design

RCT

Single or multicentre study; if multicentre, number of recruiting centres

 Enrolment

Child age at each assessment (in months)

% participants at post-intervention

% participants at latest follow-up

Participants

 Setting

Primary care, hospital, community, home, or combination

 Recruitment region

Select one of: (i) USA; (ii) UK; (iii) Canada; (iv) Australia; (v) other (specify)

 Characteristics of participants

At baseline:

Sample size

Child sex (percentage male)

Parent sex (percentage male)

Parent race/ethnicity (non-minority, minority, diverse)

Child race/ethnicity (non-minority, minority, diverse)

Child risk status (perinatal/postnatal risk, socio-emotional/behavioural problems)

Socio-demographic risk (education, income)

Family-level risk status (adolescent parent, parent age, mental health)

Intervention

 Components, routes of delivery, timing, frequency, intervention protocols, length of intervention

Intervention name (list).

Specific responsive parenting target (coded as affective-emotional responsiveness (e.g., warmth, contingent responding, acceptance), cognitive responsiveness (joint attention, rich verbal input, scaffolding), or positive behavioural guidance (e.g., positive discipline, reinforcement/praise, positive behavioural support, contingencies) or emotion socialization (e.g., emotion coaching, validation)

Parents included, one vs. both

Intensity/duration (brief description of # weeks/sessions)

 Factors relevant to implementation

Delivered by (list who administered intervention)

 Definition of ‘control groups’

Comparison group: coded as control; treatment-as-usual; waiting list.