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Table 4 Association between oral polio vaccine (OPV) immunisation coverage and mortality rates of sudden infant death syndrome (SIDS) (United States, 1975–2009)

From: Association between sudden infant death syndrome and diphtheria-tetanus-pertussis immunisation: an ecological study

  Estimate [per 10% increase] IRR (95% CI)
OPV immunisation coverage −0.07 0.94 (0.89, 0.98)
Infant sleep position (supine) −0.12 0.89 (0.86, 0.92)
  1. CI, confidence interval; IRR, incidence rate ratio.