Abortion changes among residents of an abortion rights protective state
Data files
Jan 21, 2026 version files 3.18 KB
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OOSdryad.csv
2.09 KB
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README.md
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Abstract
We sought to study the association of Texas' SB8 and changes to abortion for Colorado residents using data from the Colorado Department of Public Health and Environment Generalized linear Quasi-Poisson regression was used in interrupted time series models, adjusting for time using both a linear term for long term trends and a harmonic term for seasonality, setting the interruption point for each model where significant changes in legal access occurred. The interruption point for the Texas analysis is set at September 2021 plus a 3-month lag-to-effect.
After Texas implemented a 6 week ban, Colorado residents experienced increased demand for procedures in the second trimester and were 83% more likely to have procedures in that trimester when compared to the time period before the change in Texas law. Rate Ratio (RR):1.83, 95% confidence interval (CI): 1.55-2.17.
This study found changes in in-state resident demand for abortion was associated with Texas SB8. from restrictions on abortion access may stretch across jurisdictional boundaries and affect residents’ abortion access even in protective states such as Colorado. A likely explanation for this impact on Colorado residents is that the increased demand for procedures from out-of-state residents resulted in delayed appointments. Potential consequences of delayed procedures for in-state residents may include increased cost, increased complexity of the procedure with shift to surgical abortion versus medication abortion, the emotional toll of waiting longer, and the potential for having a pregnancy revealed that otherwise would not have been, which may be dangerous for those in abusive relationships.
https://doi.org/10.5061/dryad.dz08kps64
CDPHE aggregated monthly data on induced abortions, with information about state of residence and gestational week of procedure.
Blank cells represent months for which data was not available at the time of collection.
Description of the data and file structure
Time series data format where each line of code represents data for one month.
year= year of the observation
month= month of the observation
colorado= total number of abortions for Colorado residents in that month
heartbeat= binary logic operator indicating before or after Texas SB8 law
time= sequential numeric operator for time
cogest12= number of abortions at or before 12 weeks of pregnancy among Colorado residents
cogest1327= number of abortions between 13-27 weeks of pregnancy among Colorado residents
Sharing/Access information
Data was derived from the following sources:
- Data request to CDPHE
All data was obtained from Colorado Department of Public Health and Environment, induced termination of pregnancy. Data was available as monthly aggregates from 2018-2024, with information on gestational week at the time of termination and state of residence of the patient. Preliminary data cleaning was performed in Excel, statistical analysis in R.