Model specification of multivariate logistic model for IBI
| Coefficients | OR | ||
| (Intercept) | −9.16 | 0.00 | |
| Feverkidstool | Male | −0.19 | 0.83 |
| Age <1 year* | −2.53 | 0.08 | |
| Age ≥1 year* | 0.00 | 1.00 | |
| Temperature | −0.05 | 0.95 | |
| Fever duration in days | −0.15 | 0.86 | |
| Tachypnoea | −0.44 | 0.65 | |
| Tachycardia | 0.69 | 2.00 | |
| Hypoxia | −0.87 | 0.42 | |
| Increased work of breathing | −0.31 | 0.73 | |
| Ill appearance | 0.87 | 2.38 | |
| ln CRP | 0.76 | 2.14 | |
| NICE warning signs | Abnormal neurology | 1.54 | 4.66 |
| Non-blanching rash | 1.38 | 3.96 | |
| Comorbidity | Complex chronic condition | 2.41 | 11.1 |
The risk of children aged <1 year was calculated: β(age <1 year)×age in years.
The risk of children aged ≥1 year was calculated: β(age <1 year)×1+(age in years−1)×β (age ≥ 1 in years).
*Age <1 year and age ≥1 year were calculated linear-piecewise.
CRP, C reactive protein; IBI, invasive bacterial infection; ln, natural log.