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)