State-level trends in sudden unexpected infant death and immunization in the United States: an ecological study

BMC Pediatrics

Table 4 Unadjusted Regression Analyses of Sudden Unexpected Infant Death and Sudden Infant Death Syndrome (all states)

	Sudden unexpected infant death	Sudden infant death syndrome
	RR (95% CI)^a	RR (95% CI)^a
3+ DTP^b	0.89 (0.77, 1.02)	0.88 (0.73, 1.07)
4+ DTP^c	0.83 (0.78, 0.88)	0.83 (0.76, 0.91)
3+ Polio^d	0.93 (0.83, 1.04)	1.00 (0.87, 1.15)
3+ Hib^e	0.91 (0.84, 0.99)	0.88 (0.78, 0.99)

^a Using a simulation (bootstrap) method with N = 10.000 runs to determine CI. RR are per 10% increase in the independent variable
^b 3 or more doses of any diphtheria and tetanus toxoids and pertussis vaccines, including diphtheria and tetanus toxoids, and any acellular pertussis vaccine (DTP/DTaP/DT)
^c 4 or more doses of any diphtheria and tetanus toxoids and pertussis vaccines, including diphtheria and tetanus toxoids, and any acellular pertussis vaccine (DTP/DTaP/DT)
^d 3 or more doses of any poliovirus vaccine
^e 3 or more doses of Haemophilus influenzae type b (Hib) vaccine
CI indicates confidence interval; DTP, diphtheria-tetanus-pertussis; Hib, Haemophilus influenzae type b; RR, rate ratio

ISSN: 1471-2431