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. 2022 Jan 25;12(1):e055968. doi: 10.1136/bmjopen-2021-055968

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© Author(s) (or their employer(s)) 2022. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Difference in monthly coverage (2020 minus 2019), measured at 1 month following due date,^a for pertussis-containing vaccines among children who turned 3, 5, 7 and 19 months in each month in Alberta, Canada. ^aOne month following due date is defined as: up to and including 30 or 31 days following the due date, depending on the calendar month (28 or 29 for the month of February, depending on year). ^b95% CIs for coverage do not overlap for first dose. ^c95% CIs for coverage do not overlap for second dose. ^d95% CIs for coverage do not overlap for third dose. ^e95% CIs for coverage do not overlap for fourth dose.