Table 2.

Equity impact classification criteria

Equity impact	Classification criteria
Positive	Evidence that lower SES groups are relatively more responsive to intervention
Neutral	No evidence that intervention has differential impact across low and high SES groups
Negative	Evidence that higher SES groups are relatively more responsive to intervention
Mixed/unclear	Mixed equity effects and/or unable to assess overall intervention equity impact

Source: Brown et al (2014) Equity impact of population-level interventions and policies to reduce smoking in adults: a systematic review. Drug and Alcohol Dependence.

SES, socioeconomic status.