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Table 1 Study quality assessment categories. Modified from Haddaway et al. [45]

From: What specific plant traits support ecosystem services such as pollination, bio-control and water quality protection in temperate climates? A systematic map protocol

Quality assessment term applied

Replication

Sample selection

Other sources of bias

Yes

Well-replicated (>10 samples per group)

Random or blocked or exhaustive

None evident

Partially

Moderate level of replication (4–10 samples per group)

Not stated but clearly random or blocked

Potential confounder

Not at all

Poorly-replicated or not stated (1–3 samples per group)

Purposive or not stated

Clear confounder