At univariate logistic regression analyses, duration of symptoms before hospitalization, birth weight, preterm birth, signs of respiratory distress, RR > 2 SDS, need of oxygen therapy, presence of fever, refill time > 2 s, presence of severe pneumonia, CRP levels, and hematocrit < 2 SDS resulted significant and then were included in the multivariate analyses (Table 2). Here, CRP is linked to pneumonia.