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Table 4 Measures of additive interaction between lifestyle score and Townend index on COVID-19 outcomes

From: The association between a lifestyle score, socioeconomic status, and COVID-19 outcomes within the UK Biobank cohort

Measure of additive interaction Estimates (95% confidence intervals)
COVID-19 mortality Severe COVID-19
RERI 0.92 (0.57–1.27) 0.53 (0.29–0.78)
Attributable portion 0.36 (0.23–0.49) 0.22 (0.12–0.31)
Synergy index 2.45 (1.42–4.25) 1.58 (1.22–2.04)
  1. RERI, relative excess risk due to interaction. Where RERI and attributable portion = 0 and synergy index = 1, there is no evidence of additive interaction