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. 2022 Feb 10;9:822557. doi: 10.3389/fnut.2022.822557

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Copyright © 2022 Asoudeh, Dashti, Jayedi, Hemmati, Fadel and Mohammadi.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Forest plots showing relative risks of developing rheumatoid arthritis for highest vs. lowest categories of (A) coffee intake, (B) caffeinated coffee intake, (C) decaffeinated coffee intake, and (D) caffeine intake.