Economics of immunization information systems in the United States: assessing costs and efficiency

Table 1 Number of immunization information systems (IIS) stratified* by child enrollment and IIS functional score

		Score of achievement of IIS functional standards^†
		<37.1%	≥37.1% & <69.9%	69.9% +
		Low^§	Medium	High
IIS integrated within larger system
Children <6 years of age enrolled
<1.7%	Low	Unknown	0	4 (3)
≥1.7% & <53.5%	Medium	0	5 (2)	5 (2)
53.5% +	High	0	7 (2)	1 (1)
IIS operating as independent system
Children <6 years of age enrolled
<1.7%	Low	Unknown	0	2 (2)
≥1.7% & <53.5%	Medium	0	4 (2)	4 (2)
53.5% +	High	0	4 (2)	3 (2)
		17 (4)	20 (8)	19 (12)

* Two IIS were randomly sampled from each stratum or all IIS sampled if ≤ 2 in a stratum with the exception of high functional score and low child enrollment where 3 were sampled because 2 states shared the same IIS. Number sampled is in parentheses. Cut points in the strata were chosen to represent natural breaks in the data.
^† Indicates an IIS minimum functional standard recommended by the National Center for Immunization and Respiratory Diseases (NCIRD) Technical Working Group. http://www.cdc.gov/nip/registry/st_terr/tech/stds/min-funct-stds2001.htm.
^§ 17 IIS were under development and fell into a stratum of <37.1% functional score and <1.7% child enrollment; 4 IIS were randomly sampled from this group for participation in this study.

ISSN: 1478-7547