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Fig 1.

PRISMA flow diagram.

From [74].

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Fig 1 Expand

Table 1.

Distribution of survey modes in analyzed dataset by the United Nations world regions.

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Fig 2.

Distribution of NBI values of surveys in the dataset by survey modes—forest plot.

N = 795.

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Fig 2 Expand

Fig 3.

Distribution of RR6 values of surveys in the dataset by survey modes—forest plot.

N = 795.

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Fig 3 Expand

Table 2.

Cross-classified meta-regression models estimating the relationship between survey characteristics and NBI.

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Table 2 Expand