Table 3. .
Duration of Stay and Competing Risks Regression Hazard Ratios for Time to Final Hospital Discharge Among Infants ≤60 Days Old Hospitalized With Pertussis by Predictors of Severity Between 1 September 2014 and 31 March 2016 (Pre-Policy Change) and 1 September 2016 and 31 March 2018 (Post-Policy Change) in England
| Characteristics | Number of Cases | Mean Duration, Days | Median Duration, Days (IQR) | HR (95% CI) | P |
|---|---|---|---|---|---|
| Pre-policy change | 108 | 9.28 | 5 (2–10.5) | Reference | |
| Post-policy change | 93 | 8.13 | 6 (3–10) | 1.14 (.88–1.49) | .321 |
| Admitted at 0–4 weeks | 44 | 10.44 | 8 (4–13.5) | Reference | |
| Admitted at 5–8 weeks | 157 | 8.28 | 5 (2–10) | 1.85 (1.32–2.57) | .001 |
| Preterm | 29 | 15.47 | 9 (5–20) | Reference | |
| Full-term | 122 | 7.02 | 5 (2–9) | 2.05 (1.35–3.10) | |
| Not known | 50 | 9.09 | 5 (3–10) | 1.87 (1.17–3.02) | .010 |
| Single infection | 115 | 6.79 | 5 (2–9) | Reference | |
| Coinfection | 86 | 11.38 | 6 (4–14) | .59 (.45–.78) | <.001 |
Abbreviations: CI, confidence interval; HR, hazard ratio; IQR, interquartile range.