Fig. 3: Percentage reduction in the observed annual risk of Mycobacterium tuberculosis infection in 2020 and 2021 compared to expected values in an interrupted time-series analysis. | Nature Communications

Fig. 3: Percentage reduction in the observed annual risk of Mycobacterium tuberculosis infection in 2020 and 2021 compared to expected values in an interrupted time-series analysis.

From: Mycobacterium tuberculosis transmission in China during the COVID-19 pandemic period (2020–2021) compared with the pre-pandemic period (2017–2019)

Fig. 3

The figure presents the observed percentage reduction in the annual risk of Mycobacterium tuberculosis infection for 2020 and 2021 among middle school and high school students compared to predicted values based on historic data from 2017 to 2019. The annual risk of M. tuberculosis infection was calculated by transforming the percent prevalence of tuberculin positivity in each measured year as described in the methods. The mean age of middle school students was 12.5 years and high and school students was 15.5 years. All participants from each year were included in this specific presented analysis. Other analyses included only schools with full data on all years and are presented in Supplementary Tables 4, 6 and 8. They were broadly consistent with these results.

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