| EIRnv | extra incidence rate of non-vaccinated groups |
|---|---|
| EIRv | extra incidence in vaccinated groups |
| IN | icterus neonatorum; impetigo neonatorum; incidence; incompatibility number; infundibular nucleus; in... |
| RIR | relative incidence rates; right interior rectus [muscle] |
| SIR | single isomorphous replacement; specific immune release; standardized incidence ratio; syndrome of i... |