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Table 1 Criteria for summary coding of the evidence

From: Relationship between the physical environment and different domains of physical activity in European adults: a systematic review

Percentages of records supporting association1 Summary code2 Description
0-39% associated 0 Evidence unrelated
40-50% associated in one direction and ≥25% in the opposite 0 Evidence unrelated
40-50% associated in one direction and < 25% in the opposite (+);(−) Possible evidence for a positive/negative relationship
51-100% associated in one direction and ≥25% in the opposite (+);(−) Possible evidence for a positive/negative relationship
51-100% associated in one direction and < 25% in the opposite +; - Convincing evidence for a positive/negative relationship
  1. 1 Only valid when relationship was investigated in at least three independent samples, otherwise evidence was regarded "not applicable" (coded N/A).
  2. 2 Double signed summary codes are applied when convincing positive “++”, convincing negative “--”, possible positive “(++)”, possible negative “(−−)” or no “00” associations were present in at least four independent samples.