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. 2020 Dec 30;10(2):020409. doi: 10.7189/jogh.10.020409

Figure 3.

Figure 3

Distribution of included studies and models. *One model (linear regression model) was used in both national-level and global-and-regional-level studies which we counted as national level model due to its high uses in national level studies; and one model (CODEm) was used in both global-and-regional-level and global-regional-and national-level studies which we counted as global-regional-and national-level model due to its high uses in global-regional-and national-level studies.