Table 2 Covariates for matching obtained from BiBBS baseline questionnaire

Prenatal attachment (Prenatal Attachment Inventory)

Continuous

[13]

Prenatal Depression (PHQ-8)

Continuous

[13]

Prenatal Anxiety (GAD-7)

Continuous

[13]

Ethnicity

Categorical

[13, 41, 51]

Socioeconomic position (financial security)

Continuous

[28, 48, 51]

Mother age

Continuous

[13, 28]

Parity (first child or not)

Continuous

[48]

Speaks English

Binary

[11, 51]