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Table 3 Tallies of risk of bias judgement on the five criteria. Note that some rows sum to more than 226; this is because individual wetland sites in the same study sometimes were appraised differently

From: Effects on groundwater storage of restoring, constructing or draining wetlands in temperate and boreal climates: a systematic review

Criterion

Number of studies with

 

Low risk of bias

High risk of bias

Not possible to judge

Not applicable

Comparison domain

41

185

–

–

Control matching

135

33

15

47

Effect modifiers

169

46

12

 

Measurement similarity

205

10

11

–

Other confounding factors

221

1

3

–