From the study linked in OP's article:
https://jamanetwork.com/journals/jamainternalmedicine/fullarticle/2814274?guestAccessKey=e429b9a8-72ac-42ed-8dbc-599b0f509890&utm_source=For_The_Media&utm_medium=referral&utm_campaign=ftm_links&utm_content=tfl&utm_term=012424
"Many US women report experiencing sexual violence, and many seek abortion for rape-related pregnancies.1 Following the US Supreme Court's 2022 Dobbs v Jackson Women's Health Organization (Dobbs) decision overturning Roe v Wade, 14 states have outlawed abortion at any gestational duration.2 Although 5 of these states allow exceptions for rape-related pregnancies, stringent gestational duration limits apply, and survivors must report the rape to law enforcement, a requirement likely to disqualify most survivors of rape, of whom only 21% report their rape to police.3
Post Dobbs, 10 or fewer legal abortions occurred monthly in each of the total abortion ban states.4 We estimated rape-related pregnancies by state to assess how abortion bans affected survivors of rape.
Methods
Because to our knowledge no recent reliable state-level data on completed vaginal rapes (forced and/or drug/alcoholfacilitated vaginal penetration) are available, we analyzed multiple data sources to estimate reported and unreported rapes in states with total abortion bans (Table 15). We also estimated the number of resulting pregnancies based on findings from prior research on rape-related pregnancy rates (eMethods in Supplement 1). This study followed the relevant sections of the Strengthening the Reporting of Observational Studies in Epidemiology (STROBE) reporting guideline. The institutional review boards of our institutions did not consider analyses of publicly available data human participants research.
To estimate the contemporary incidence of vaginal rape nationally, we analyzed the US Centers for Disease Control and Prevention's (CDC's) 2016 to 2017 National Intimate Partner and Sexual Violence survey (which used special methods to accurately ascertain reported and unreported rapes). We adjusted for the fraction of survivors who were female individuals aged 15 to 45 years using data from the Bureau of Justice Statistics' (BJS) annual survey on criminal victimization (which is known to underestimate rapes5)3 and further adjusted for the percentage of rapes that are vaginal.1 We calculated 95% CIs using measures of uncertainty from the CDC survey. The CDC and BJS surveys do not include state-level data; thus, we apportioned the 2022 nationwide rape estimate among states based on the US Federal Bureau of Investigation's most recent Uniform Crime Reports, which include rapes reported to law enforcement in 2019.
To estimate rape-related pregnancies, we multiplied the state-level estimate of vaginal rapes by the fraction likely to result in pregnancy (eMethods in Supplement 1)6 and then adjusted for the number of months between July 1, 2022, and January 1, 2024, that a total abortion ban was in effect. We used Stata, version 16.1 (StataCorp), to analyze the BJS survey data and Microsoft Excel for other calculations."
So basically to come up with this number they multiplied the state estimate of vaginal rape times the fraction likely to result in pregnancy from July 2022 to Jan 1st 2024.
Seems like there's a lot of variables that could skew that number.
https://jamanetwork.com/journals/jamainternalmedicine/fullarticle/2814274?guestAccessKey=e429b9a8-72ac-42ed-8dbc-599b0f509890&utm_source=For_The_Media&utm_medium=referral&utm_campaign=ftm_links&utm_content=tfl&utm_term=012424
"Many US women report experiencing sexual violence, and many seek abortion for rape-related pregnancies.1 Following the US Supreme Court's 2022 Dobbs v Jackson Women's Health Organization (Dobbs) decision overturning Roe v Wade, 14 states have outlawed abortion at any gestational duration.2 Although 5 of these states allow exceptions for rape-related pregnancies, stringent gestational duration limits apply, and survivors must report the rape to law enforcement, a requirement likely to disqualify most survivors of rape, of whom only 21% report their rape to police.3
Post Dobbs, 10 or fewer legal abortions occurred monthly in each of the total abortion ban states.4 We estimated rape-related pregnancies by state to assess how abortion bans affected survivors of rape.
Methods
Because to our knowledge no recent reliable state-level data on completed vaginal rapes (forced and/or drug/alcoholfacilitated vaginal penetration) are available, we analyzed multiple data sources to estimate reported and unreported rapes in states with total abortion bans (Table 15). We also estimated the number of resulting pregnancies based on findings from prior research on rape-related pregnancy rates (eMethods in Supplement 1). This study followed the relevant sections of the Strengthening the Reporting of Observational Studies in Epidemiology (STROBE) reporting guideline. The institutional review boards of our institutions did not consider analyses of publicly available data human participants research.
To estimate the contemporary incidence of vaginal rape nationally, we analyzed the US Centers for Disease Control and Prevention's (CDC's) 2016 to 2017 National Intimate Partner and Sexual Violence survey (which used special methods to accurately ascertain reported and unreported rapes). We adjusted for the fraction of survivors who were female individuals aged 15 to 45 years using data from the Bureau of Justice Statistics' (BJS) annual survey on criminal victimization (which is known to underestimate rapes5)3 and further adjusted for the percentage of rapes that are vaginal.1 We calculated 95% CIs using measures of uncertainty from the CDC survey. The CDC and BJS surveys do not include state-level data; thus, we apportioned the 2022 nationwide rape estimate among states based on the US Federal Bureau of Investigation's most recent Uniform Crime Reports, which include rapes reported to law enforcement in 2019.
To estimate rape-related pregnancies, we multiplied the state-level estimate of vaginal rapes by the fraction likely to result in pregnancy (eMethods in Supplement 1)6 and then adjusted for the number of months between July 1, 2022, and January 1, 2024, that a total abortion ban was in effect. We used Stata, version 16.1 (StataCorp), to analyze the BJS survey data and Microsoft Excel for other calculations."
So basically to come up with this number they multiplied the state estimate of vaginal rape times the fraction likely to result in pregnancy from July 2022 to Jan 1st 2024.
Seems like there's a lot of variables that could skew that number.
