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. Author manuscript; available in PMC: 2017 Feb 1.
Published in final edited form as: Am J Gastroenterol. 2016 Oct 11;111(11):1614–1620. doi: 10.1038/ajg.2016.464

Figure 1. Oral Contraceptive Use and Risk of Surgery§.

Figure 1

* Abbreviations: confidence interval (CI), hazard ratio (HR), multivariable (MV), and person-year (P-Y). ¶ Adjusted for age (years), age at diagnosis (categories based on Table 1), number of encounters, education (≤ 9, 10–12, ≥ 13 yrs), and health care region of residence (categories based on Table 1).