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Table 2 Definitions of sensitivity and specificity [32].

From: Area-aggregated assessments of perceived environmental attributes may overcome single-source bias in studies of green environments and health: results from a cross-sectional survey in southern Sweden

 

Objective assessments using GIS

 

Absent

Present

Self-assessments

  

Absent

a0

a1

Present

b0

b1

Total

n0

n1

Sensitivity = True positive self-assessment = b1/n1

Specificity = True negative self-assessment = a0/n0