Table 2.

Poisson regression estimates of specific ICC incidence rate ratios by sex, race, age, and year of diagnosis based on SEER registry 18 (2000–2017)

Variable	Rate ratio
Sex
Male	1
Female	0.77 (0.75–0.81)*
Race
White	1
Black	0.83 (0.77–0.88)*
American Indian	0.93 (0.76–1.12)
Asian/Pacific Islander	1.4 (1.32–1.47)*
Age group
< 60 yr	1
60–69 yr	11.7 (11.1–12.3)*
≥ 70 yr	20.8 (19.9–21.7)*
Year
2000–2006	1
2007–2011	1.2 (1.1–1.3)*
2011+	1.8 (1.7–1.91)*

ICC, intrahepatic cholangiocarcinoma; SEER, Surveillance, Epidemiology, and End Results Program.

*Statistically significant (p < 0.05).