FIGURE 1.

Study flow chart. *125 infants with URTI/LRTI were excluded after a sensitivity analysis showed no significant difference when the 125 cases were included in the nonhospitalized group. †Transfers-out were used for lower severity and lower-risk infants in case of bed saturation. LRTI indicates lower respiratory tract infection (WHO-definition); RSV, respiratory syncytial virus; SARI, severe acute respiratory infection (WHO-definition); SARI-WI, SARI with functional impairment; SIDS, sudden infant death syndrome; S-LRTI, severe lower respiratory tract infection (WHO-definition); URTI, upper respiratory tract infection (WHO-definition); VS-LRTI, very severe lower respiratory tract infection (WHO-definition).