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. 2009 Mar 5;9:18. doi: 10.1186/1471-2431-9-18

Table 2.

Study population

Age 2 and under Group
	HMO A		HMO B

	# Eligible	# Chart reviewed	# Eligible	# Chart reviewed
UTD^a/Ever Refuse	19	15 (78.9%)	255	74 (29.0%)
UTD/Never Refuse	10,446	100 (1%)	18,335	71 (0.4%)
Not UTD/Ever Refuse	77	68 (88.3%)	202	66(32.7%)
Not UTD/Never Refuse	3,715	342 (9.2%)	6,097	104 (1.7%)
Total	14,257	525 (3.68%)	24,889	315 (1.27%)

Age 6 Group

	HMO A		HMO B

UTD/Ever Refuse	8	8 (100%)	31	28 (90.3%)
UTD/Never Refuse	3,128	30 (0.96%)	7,789	63 (0.8%)
Not UTD/Ever Refuse	25	24 (96%)	34	31 (91.2%)
Not UTD/Never Refuse	1,960	153 (7.8%)	5,305	72 (1.4%)
Total	5,121	215 (4.20%)	13,159	194 (1.47%)

^aUTD: Up-to-date immunization status