Table 1 Pregnancy-associated listeriosis 1997 to 2016, characteristics and incidence
Characteristic of mother | Total casesn (%) | Women giving birth (× 1000) b | Incidence per 100,000 (95% CI) | IRR (95% CI) | p value |
|---|---|---|---|---|---|
Age (n = 147) | |||||
15 to 19 | 7 (4.8) | 81 | 8.7 (4.2, 17.9) | 1 | 0.16 |
20 to 24 | 22 (15.0) | 214 | 10.3 (6.8, 15.6) | 1.19 (0.53, 3.00) | 0.69 |
25 to 29 | 39 (26.5) | 312 | 12.5 (9.1, 17.1) | 1.44 (0.69, 3.53) | 0.37 |
30 to 34 | 35 (23.8) | 352 | 9.9 (7.2, 13.8) | 1.15 (0.54, 2.82) | 0.74 |
35 to 39 | 26 (17.7) | 196 | 13.3 (9.1, 19.5) | 1.53 (0.70, 3.83) | 0.32 |
40 to 45 | 11 (7.5) | 43 | 25.6 (14.3, 45.8) | 2.95 (1.16, 8.02) | 0.025 |
Unknown | 7 | ||||
Prioritised ethnicity (n = 115) a | |||||
European or other | 44 (29.9) | 511 | 8.6 (6.4, 11.6) | 1 | < 0.001 |
Māori | 17 (11.6) | 240 | 7.1 (4.4, 11.3) | 0.82 (0.46, 1.41) | 0.49 |
Pacific | 33 (22.4) | 108 | 30.6 (21.8, 43.0) | 3.56 (2.25, 5.57) | < 0.001 |
Asian | 21 (14.3) | 106 | 19.7 (12.9, 30.2) | 2.29 (1.34, 3.81) | 0.002 |
Unknown | 0 | ||||
Overall | 147 | 1197 | 12.3 (10.4, 14.4) | ||