Comparison of cases with non-cases
| Cases (n=20) | Non-cases (n=290) | RR* | 95% CI | p Value | ||
|---|---|---|---|---|---|---|
| Sex | Male | 13 (65%) | 149 (51%) | 1.69 | 0.63 to 5.02 | 0.36 |
| Multiples | Yes | 8 (40%) | 76 (26%) | 1.79 | 0.64 to 4.77 | 0.30 |
| Birth weight (g) | Median (range) | 1105 (620–2640) | 2400 (468–4,87) | 0.26 | 0.14 to 0.49 | <0.001 |
| Gestational age (weeks) | Median (range) | 27+5 (24+2–36+2) | 35+6 (24+3–42+6) | 0.77 | 0.695 to 0.858 | <0.001 |
| Fatalities† | Yes | 4 (20%) | 22 (8%) | 2.73 | 0.66 to 8.46 | 0.16 |
| Sepsis | Yes/no | 9 (45%) | 41 (14%) | 4.25 | 1.56 to 11.29 | 0.005 |
Twenty cases born and identified between 1 January and 31 October 2011, and 290 non-cases born in the same time period treated in the paediatric clinic, univariable analysis.
*Relative risk (RR) and p values calculated using Poisson regression or exact Poisson regression (where possible) and corresponding 95% CI.
†All fatalities among cases and non-cases counted, not differentiating causes.