Improving immunisation timeliness in Aboriginal children through personalised calendars

BMC Public Health

Table 1 Effectiveness of calendar – delay in subsequent immunisations (outliers included)

Study groups	Year of immunisation	Type of immunisation *	Calendar received at last immun-isation	No. of doses			Mean delay (months)			95% CI **
				Given at AMSWS			Given at AMSWS
				No	Yes	Total	No	Yes	Total	Total
Pre-Calendar program	2005-2007	02 M		86	176	262	1.0	0.8	0.9	−2.2	3.9
		04 M		97	163	260	1.3	2.2	1.9	−1.6	5.4
		06 M		79	167	246	2.0	3.3	2.9	−0.5	6.2
		12 M		68	162	230	2.2	2.7	2.5	0.0	5.1
		18 M		53	91	144	1.4	3.5	2.7	0.1	5.3
		all		383	759	1142	1.6	2.4	2.1	−0.9	5.0
Calendar Program -intervention period Jan 2008-Sept 2009 - observation period Oct 2009-Sept 2011	2008-2011	02 M	N/A	47	111	158	0.6	0.5	0.5	−1.6	2.7
		04 M	No	47	88	135	2.4	3.8	3.3	−2.0	8.7
			Yes	1	31	32	2.5	0.3	0.4	−0.3	1.1
		06 M	No	63	100	163	5.1	4.7	4.8	−0.6	10.3
			Yes	2	25	27	12.8	0.5	1.4	−1.9	4.7
		12 M	No	72	129	201	3.5	3.2	3.3	0.1	6.4
			Yes	5	24	29	1.6	0.9	1.0	−0.1	2.1
		18 M	No	97	139	236	5.0	4.3	4.6	1.0	8.2
			Yes	3	16	19	0.3	0.9	0.8	−0.3	1.9
		all	No	326	567	893	3.7	3.3	3.4	−0.6	7.5
			Yes	11	96	107	3.4	0.6	0.9	−0.8	2.6

* Immunisations defined as to the age of the child in months when the vaccine was due according to the NSW Immunisation schedule. The specific vaccines which were used in the analysis to assess immunisation status were: 02M= dTpa1; 04M= dTpa2; 06M=dTpa3; 12M= MMR; 18M=varicella.
** CI very large for group of children who did not receive calendars due to several outliers with very delayed vaccination.

ISSN: 1471-2458