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. 2021 Oct 11;40(11):955–961. doi: 10.1097/INF.0000000000003279

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Copyright © 2021 The Author(s). Published by Wolters Kluwer Health, Inc.

This is an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License 4.0 (CCBY-NC-ND), where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially without permission from the journal.

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FIGURE 4. — Calculation of the reproductive number. A: Dependence of the reproductive number on the educational level and the corresponding associated age. Frequency of the number of secondary cases per index case for preschool (B, F) primary (C, G), middle (D, H), and high (E, I) school, using linear (B–E) and logarithmic (F–I) scales. Poisson distribution is fitted employing a least square method for red lines in panels (B–I), and the negative binomial distribution is fitted employing maximum likelihood estimation method¹⁰ for blue lines in panels (F–I) giving rise to values R = 0.27 and dispersion parameter k = 0.41 (F), R = 0.35 and dispersion parameter k = 0.32 (G), R = 0.55 and dispersion parameter k = 0.35 (H), R = 0.56 and dispersion parameter k = 0.41 (I).