Prediction of VS-LRTI using clinical variables and serological status
Preterm infants were excluded from the GLM given that a 3-month follow-up was not sufficient to analyze their risk of being admitted to hospital for VS-LRTI (they might have been hospitalized since birth at 3 months of age). In multivariate analysis, maternal multiparity (Relative Risk, RR: 2.34, 95%CI [1.58; 3.01]) and a date of birth before the peak of the epidemic (RR: 2.84, 95%CI [2.08; 3.59]) were significantly associated with the occurrence of VS-LRTI; there was no significant association between antibody titer and VS-LRTI (Table 2).