About the Data
Methods
This data brief uses 2020 data from the Maternal and Infant Health Assessment (MIHA) survey, a statewide representative survey of individuals with a recent live birth in California, conducted annually since 1999, linked to birth certificates. The survey collects self-reported information about maternal and infant experiences before, during, and shortly after pregnancy.
MIHA is a stratified random sample of English- or Spanish-speaking individuals. MIHA data used in this brief are weighted to be representative of California residents with a live birth from May 16, 2020 to June 15, 2020, excluding those who were younger than 15 years old at delivery, had a multiple birth greater than triplets, or had a missing address on the birth certificate. The MIHA 2020 sample size was 6,363. For more information on weighting and technical definitions, see the MIHA Technical Notes at
go.cdph.ca.gov/MIHA-methods.
MIHA is led by the Maternal, Child and Adolescent Health Division in the California Department of Public
Health (CDPH) in collaboration with the CDPH Women, Infants and Children (WIC) Division and the Center for Health Equity at the University of California, San Francisco.
Definitions
Self-reported symptoms of anxiety and depression were ascertained using an adapted four-item Patient Health Questionnaire (PHQ-4), which includes the two- item Generalized Anxiety Disorder (GAD-2) scale and the twoitem PHQ-2, which assesses symptoms of depression.14 Adaptations to the PHQ-4 for use in MIHA included (1) changing the time period from āOver the last 2 weeksā to the prenatal period ("During your pregnancy") and postpartum period ("Since your most recent birth") and (2) changing the response categories from the frequency of days in the past two weeks to a general frequency scale ("always," "often," "sometimes," "rarely," and "never").15 Measures were defined as follows:
Anxiety symptoms ā During pregnancy or since most recent birth, always or often felt nervous, anxious or on edge, or was unable to stop or control worrying.
Depression symptoms ā During pregnancy or since most recent birth, always or often felt down, depressed or hopeless, or had little interest or pleasure in doing things usually enjoyed.
Anxiety and/or depression symptoms ā During pregnancy or since most recent birth, experienced either anxiety symptoms, depression symptoms, or both.
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