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Table 3 Weights applied to evidence items, based on the study design and number of independent sampling units [ [27]]

From: Will environmental flows increase the abundance of native riparian vegetation on lowland rivers? A systematic review protocol

Study design Weight applied
After impact only 1
Reference/control vs. impact (no before data) 2
Before vs. after (no reference/control data) 2
Gradient response (temporal or spatial) 3
BACI/BARI or MBACI/MBARI or Beyond MBACI 4
Factorial design: Number of independent reference/control sampling units  
0 0
1 2
>1 3
Factorial design: Number of independent impact sampling units  
1 0
2 2
>2 3
Gradient designs: Number of sampling units  
3 0
4 2
5 4
≥6 6
  1. The evidence weight is the sum of the weight applied for the study design and the number of sampling units. See text for an explanation of weights. "B" = before, "A" = After, "C" = control, "R" = reference, "I" = impact, "M" = multiple.