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Table 1 Mean and range of the three-monthly percentage of fully immunised children 12–15 months of age, HNELHD and rest of NSW, over three time periods June 2007 to September 2014

From: Closing the gap in Australian Aboriginal infant immunisation rates -- the development and review of a pre-call strategy

Time Period   Percentage HNELHD 12–15 month olds fully immunised Percentage rest of NSW 12–15 month olds fully immunised p values for gapa
Fully immunised Non-Aboriginal Aboriginal Gap Non-Aboriginal Aboriginal Gap
T1 (Jun 07–Dec 09) mean 26,232/27,944 (93.9 %) 1,913/2,238 (85.5 %) 8.4 % 206,207/224,803 (91.7 %) 6,191/7,232 (85.6 %) 6.1 % 0.437
rangeb 93.1–94.5 % 82.3–88.7 %   91.4–92.2 % 83.2–88.2 %   
T2 (Mar 10–Dec 12) mean 28,803/30,824 (93.4 %) 2,408/2,758 (87.2 %) 6.2 % 229,221/251,010 (91.3 %) 7,732/9,020 (85.7 %) 5.6 % 0.060
rangeb 92.6–94 % 84.4–91.1 %   89.6–91.9 % 83.0–88.2 %   
T3 (Mar 13–Sep 14) mean 16,674/18,063 (92.3 %) 1,901/2,090 (90.9 %) 1.4 % 132,772/147,366 (90.1 %) 85,215/6,037 (6.3 %) 3.8 % 0.752
rangeb 91.1–93.7 % 88.1–93.6 %   88.8–92.3 % 82.3–90.1 %   
p-value     0.0001    0.004  
  1. acalculated via Wald test comparing gradients of each line within time periods
  2. brange reflects quarterly cohort coverage provided by the Australian Childhood Immunisation Register