Supplemental Table 2.

Data source descriptions

Data source	Population	Dates	Data available or used	Purpose	Other details	Link
WA-CPC	240 cases of SARS-CoV-2 in pregnant patients aged ≥18 y in Washington State at 35 hospitals and clinics	March 1, 2020, to June 30, 2020	Demographic and clinical data retrospectively abstracted from medical records	•Estimating the SARS-CoV-2 infection rate in pregnancy at collaborating study sites •Describing the distribution of race and ethnicity and language used for medical encounters among pregnant patients with SARS-CoV-2 infection	WA-CPC sites capture ∼61% of annual deliveries in Washington State	N/A
WA-DOH: SARS-CoV-2 case counts in pregnancy	346 cases of SARS-CoV-2 in pregnant patients aged 18–50 y across Washington State	March 1, 2020, to June 30, 2020	Number of cases by ACH region	•To compare the number of cases identified at WA-CPC sites at the ACH region and state level	Individual-level data on each case was not publicly available	N/A
			Pregnancy status was ascertained through case interviews and by local health department investigation	•To estimate and compare state SARS-CoV-2 pregnancy rates with the WA-CPC estimates	35% of SARS-CoV-2 case records among females aged 18–50 y contained unknown or missing pregnancy status	Data (case counts) acquired through written communication with the WA-DOH (Hanna Oltean, MPH)
WA-DOH birth data dashboard tool: Birth Certificate Data 2018	Data on live births in Washington State in 2018 at ACH regional and state levels; all maternal ages included	2018	Number of live births, maternal race and ethnicity distribution	•To calculate the proportion of annual state deliveries covered by the WA-CPC sites •To compare the race and ethnicity distribution of those who delivered (live births) in 2018 vs the race and ethnicity distribution of cases of SARS-CoV-2 in pregnancy at WA-CPC sites •Provided the denominator data to estimate the SARS-CoV-2 infection rate in pregnancy for the WA-DOH’s reported number of SARS-CoV-2 cases in pregnancy during the study period (to compare to the WA-CPC estimated infection rates in pregnancy)	Individual-level data on each live birth in 2018 was not publicly available	https://www.doh.wa.gov/DataandStatisticalReports/HealthDataVisualization/BirthDashboards/AllBirthsACH Accessed Aug. 21, 2020
WA-DOH: COVID-19 dashboard (confirmed cases by week of Illness onset, county, and age)	Cases of confirmed SARS-CoV-2 reported to the WA-DOH; males and females aged 20–39 y	March 1, 2020, to June 28, 2020	Number of cases by ACH region	•To estimate the SARS-CoV-2 infection rate (numerator) among patients aged 20–39 y in Washington State at the ACH region and state levels to compare the infection rates in pregnancy	Data were available by age or gender, not both	https://www.doh.wa.gov/Emergencies/COVID19/DataDashboard
					Individual-level data on each case were not publicly available	Accessed Sept. 7, 2020
Washington State Office of Financial Management	Postcensal population estimates for patients aged 20–39 y	2019	Population estimates by ACH region and statewide	•To estimate the SARS-CoV-2 infection rate (denominator) among patients aged 20–39 y in Washington State to compare the infection rates in pregnancy		https://www.ofm.wa.gov/washington-data-research/population-demographics/population-estimates/estimates-april-1-population-age-sex-race-and-hispanic-origin Published 2020 Accessed Sept. 21, 2020
WA-DOH: ACH social determinants of health dashboard	Percentage of Washington State individuals aged >5 y with limited English language proficiency (those who speak English “less than very well”)	2014–2017	Proportion of individuals by ACH region and statewide with limited English language proficiency	•To compare the proportion of pregnant women with SARS-CoV-2 who preferred a non-English language in medical encounters with the proportion of individuals with limited English language proficiency in Washington State and by select ACH regions	No count data were available on the WA-DOH website. Only prevalence estimates were available, which limited the ability to generate 95% confidence intervals around comparative point estimates	https://www.doh.wa.gov/DataandStatisticalReports/HealthDataVisualization/SocialDeterminantsofHealthDashboards/ACHSocialDeterminantsofHealth
					Language data were collected as part of the American Community Survey	Accessed Sept. 17, 2020

ACH, Accountable Communities of Health; COVID-19, coronavirus disease 2019; N/A, not applicable; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2; WA-CPC, Washington State COVID-19 in Pregnancy Collaborative; WA-DOH, Washington State Department of Health.

Lokken et al. Severe acute respiratory syndrome coronavirus 2 infection rate in pregnancy. Am J Obstet Gynecol 2021.