Differences in Pertussis Incidence by Income among Oregon Teens during an Outbreak

Table 1

2012 Northwest Oregon teen pertussis by income categories.

	Zip code income stratum
	Lower	Middle	Upper
Zip code	22	95	21
Population (age 13–16)	12,416	72,108	23,905
Median household income	35,827	54,303	77,940
Tdap immunization rate (age 13–16)	85.40%	88%	88.10%
VFC pertussis immunization	33.70%	25.80%	12.50%
Median time since Tdap (years)	2.87	2.97	3.12
Pertussis cases (age 13–16)	8	57	47
Cases/1,000	0.64	0.79	1.97
Risk ratio & 95% CI	1.0 (ref.)	1.23 (0.59–2.57)	3.05 (1.44–6.46)