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Table 2 Listeriosis in children aged 28 days to < 15 years from 1997 to 2016, characteristics and incidence

From: The epidemiology of listeriosis in pregnant women and children in New Zealand from 1997 to 2016: an observational study

Characteristic of childTotal cases, count (%)
n = 22
Person-years (×  1,000,000)bIncidenceIRR (95% CI)p value
Age (years)
 29 days to < 1 year6 (27)1.190.51 (0.23, 1.10)10.006
 1 to 48 (36)4.750.17 (0.09, 0.33)0.33 (0.12, 1.01)0.042
 5 to 94 (18)5.970.07 (0.03, 0.17)0.13 (0.03, 0.46)0.002
 10 to 144 (18)5.990.07 (0.03, 0.17)0.13 (0.03, 0.46)0.002
Sex
 Female10 (45)8.720.11 (0.06, 0.21)00.759
 Male12 (55)9.180.13 (0.07, 0.23)1.14 (0.49, 2.70)0.759
Ethnicity a
 European or other7 (32)10.290.07 (0.03, 0.14)10.117
 Māori5 (23)4.340.12 (0.05, 0.27)1.69 (0.50, 5.30)0.369
 Pacific4 (18)1.650.24 (0.09, 0.62)3.56 (0.93, 11.78)0.043
 Asian4 (18)1.620.25 (0.10, 0.63)3.63 (0.95, 12.01)0.040
 Unknown2    
Overall2217.900.12 (0.08, 0.19)  
  1. aEthnicity is prioritised in the order Maori, Pacific, Asian, European or other
  2. bPerson years calculated as the sum of the estimated resident population (ERP) for years 1997 to 2016
  3. IRR Incidence rate ratio. P value derived from likelihood ratio test (italics) or comparison with reference group
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