As data are reported voluntarily by providers to state or area health departments, information may be incomplete and result in undercounting abortions when calculating rates and ratios in some states. Abortions by state of occurrence include abortions obtained by non-residents of the state as well as those obtained by residents.
Sources:
Abortion Surveillance -- United States, 2005. Table 3. Morbidity and Mortality Weekly Report, Vol. 57, No. SS-13. Centers for Disease Control and Prevention, November 2008. Available at http://www.cdc.gov/mmwr/pdf/ss/ss5713.pdf
