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Table 2 Variables (domains) assessed during critical appraisal of primary study validity

From: What are the effects of agricultural management on soil organic carbon in boreo-temperate systems?

Variable Value Score
Spatial (true) replication 2 replicates 0
3–4 replicates 1
>4 replicates 2
Temporal replication ≤3 replicates 0
4–6 replicates 1
>6 replicates 2
Treatment allocation (as described for the full experimental design) Purposive (selective) 0
Split-/strip-plot/Latin square/blocked/randomised/exhaustive 2
Duration of experiment 10–19 years 0
20–29 years 1
≥30 years 2
Soil sampling depth Shallow (<15 cm) single or multiple sampling 0
Plough layer (0–25 cm) single or multiple sampling, or deep (>25 cm) single sampling 1
Multiple deep sampling (>25 cm) 2
  1. Details of scores assigned to different values are also given