Pearson or Spearman correlations were used to assess relationships between immune and respiratory variables, and with age
ProcedureBaseline serum IgG, IgA, IgM (nephelometry), total WBC count (automated analyzer), RR (manual count), and SaO2 (pulse oximetry) were measured. Pearson or Spearman correlations were used to assess relationships between immune and respiratory variables, and with age.