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.

Abbott et al.

Abbott et al. BMC Public Health 2013 13:598   doi:10.1186/1471-2458-13-598

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