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Table 1 Pregnancy-associated listeriosis 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 motherTotal casesn (%)Women giving birth (× 1000) bIncidence per 100,000 (95% CI)IRR (95% CI)p value
Age (n = 147)
 15 to 197 (4.8)818.7 (4.2, 17.9)10.16
 20 to 2422 (15.0)21410.3 (6.8, 15.6)1.19 (0.53, 3.00)0.69
 25 to 2939 (26.5)31212.5 (9.1, 17.1)1.44 (0.69, 3.53)0.37
 30 to 3435 (23.8)3529.9 (7.2, 13.8)1.15 (0.54, 2.82)0.74
 35 to 3926 (17.7)19613.3 (9.1, 19.5)1.53 (0.70, 3.83)0.32
 40 to 4511 (7.5)4325.6 (14.3, 45.8)2.95 (1.16, 8.02)0.025
 Unknown7    
Prioritised ethnicity (n = 115) a
European or other44 (29.9)5118.6 (6.4, 11.6)1< 0.001
Māori17 (11.6)2407.1 (4.4, 11.3)0.82 (0.46, 1.41)0.49
Pacific33 (22.4)10830.6 (21.8, 43.0)3.56 (2.25, 5.57)< 0.001
Asian21 (14.3)10619.7 (12.9, 30.2)2.29 (1.34, 3.81)0.002
Unknown0    
Overall147119712.3 (10.4, 14.4)  
  1. P values in italics represent overall likelihood ratio test for the age or ethnicity. All other p values represent Wald pairwise comparisons with reference group
  2. aEthnicity is prioritised in the order Maori, Pacific, Asian, European or other. Comparisons by ethnicity are restricted to years 2001 to 2016 due to availability of denominator data
  3. bBirths as recorded in the NZ MoH Maternity Collection
  4. IRR Incidence rate ratio
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