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Table 3 Multiplicative and additive interactiona between diabetes mellitus and ever glucocorticoid use

From: The effect of glucocorticoid therapy on mortality in patients with rheumatoid arthritis and concomitant type II diabetes: a retrospective cohort study

Outcome Multiplicative interaction Additive interaction
Hazard ratio (95% confidence interval) RERI (95% confidence interval) RAE (95% confidence interval)
All-cause mortality
 Unadjusted 0.69 (0.51 to 0.91) 0.94 (−0.29 to 2.16) 1.27 (0.95 to 1.70)
All-cause mortality
 Adjustedb 0.86 (0.64 to 1.15) 0.41 (−0.36 to 1.18) 1.22 (0.86 to 1.72)
CV mortality
 Unadjusted 0.70 (0.44 to 1.11) 0.40 (−1.19 to 2.00) 1.17 (0.64 to 2.14)
CV mortality
 Adjustedb 0.93 (0.60 to 1.48) 0.11 (−0.75 to 0.96) 1.11 (0.48 to 2.57)
  1. a On the multiplicative scale significant interaction is different than 1, on the additive scale significant interaction for the RERI is different than 0 and for the RAE is different than 1
  2. bAdjusted for age, gender, Charlson comorbidity index, baseline BMI, baseline smoking status, DMARDs, prior GC, prior macrovascular disease and NSAIDs