Page 126 - IJPS-1-1

Using panel data to examine pregnancy attitudes over time

ity attitudes prospectively.

Supporting Information

The Supporting Information is available free of charge on the IJPS website at
http://ijps.whioce.com/index.php/ijps/article/view/01007/pdf_11.

Conflict of Interest and Funding

There was no conflict of interest. Heini Väisänen was funded by the Economic and Social
Research Council [Grant number ES/J00070/1]. The Continuity and Change in Contracep-
tive Use Study, on which this analysis was based, was supported by The JPB Foundation.
Acknowledgements and Author Contributions

The authors would like to thank participants of PAA 2015 Session 120: Fertility Intentions:
Causes and Consequences for their comments on an earlier version of the paper. Heini
Väisänen conducted the statistical analysis and wrote the first versions of ‘Data and Me-
thods’ and ‘Results’ sections. Rachel K. Jones is the principal investigator in the research
project that collected these data. She wrote the first version of the ‘Introduction’ section.
Both authors contributed to the ‘Discussion’ section and edited all the sections of the study
after putting together the first version of the manuscript.

Ethics Statement

The data of the study were collected by GfK, an online recruitment company, to administer
the survey using its Knowledge Panel. The panel is comprised of approximately 50,000
individuals and is intended to be representative of the U.S. population. GfK obtains in-
formed consent from all individuals, and because the study posed minimal risk, we were
able to obtain expedited approval from the institutional review board of the Guttmacher
Institute.
The data used in this study will be made publicly available through the Guttmacher
Institute’s Center for Population Research Innovation and Dissemination
(http://www.guttmacher.org/popcenter/), tentatively in early 2017.
References

Becker G S. (1991). A Treatise on the Family (Enlarged ed.). Cambridge, Mass, London: Harvard Uni-
versity Press.
Berrington A and Pattaro S. (2014). Educational differences in fertility desires, intentions and behaviour:
A life course perspective. Advances in Life Course Research, 21, 10–27.
http://dx.doi.org/10.1016/j.alcr.2013.12.0037.
Chibber K S, Biggs M A, Roberts S C M, et al. (2014). The role of intimate partners in women’s reasons
for seeking abortion. Women’s Health Issues: Official Publication of the Jacobs Institute of Women’s
Health, 24(1): e131–138. http://dx.doi.org/10.1016/j.whi.2013.10.007.
Finer L B and Henshaw S K. (2006). Disparities in rates of unintended pregnancy in the United States,
1994 and 2001. Perspectives on Sexual and Reproductive Health, 38(2): 90–96.
http://dx.doi.org/10.1111/j.1931-2393.2006.tb00065.x6.
Finer L B and Zolna M R. (2014). Shifts in intended and unintended pregnancies in the United States,
2001–2008. American Journal of Public Health, 104(S1): S43–S48.
http://dx.doi.org/10.2105/ajph.2013.3014162.
Frost J J, Singh S and Finer L B.(2007). Factors associated with contraceptive use and nonuse, United
States, 2004. Perspectives on Sexual and Reproductive Health, 39(2): 90–99.

International Journal of Population Studies | 2015, Volume 1, Issue 1 120