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. 2021 Feb 3;43:e2021011. doi: 10.4178/epih.e2021011

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©2021, Korean Society of Epidemiology

This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 2. — Forest plot showing the relationship between presence of gallstone and the risk of BTC. ¹OR (95% CI) refers to the estimate of effects included in a random-effects model. ²Effect size of Lai et al. [27] was calculated by pooling the results of DM group and non-DM group. ³Effect size of Lowenfels et al. [29] was calculated by pooling the results of Indian and non-Indian. ⁴Pooled the results of three types BTC subsites. ⁵Pooled the results of two types BTC subsites. The numbers are arranged in the order of Table 1. OR, odds ratio; CI, confidence interval; GBC, gallbladder cancer; CCA, cholangiocarcinoma; BTC, biliary tract cancer; EBDC, extrahepatic bile duct cancer; AOVC, ampulla of Vater cancer; DM, diabetes mellitus.