Figure 1

A. Tracheal aspirate concentrations of IL-4 normalized to secretory component in mechanically ventilated very low birth weight infants during the first 21 days of life. Number in parenthesis represents the number of TA samples assayed at each time point. B. Tracheal aspirate concentrations of IL-4 normalized to secretory component in infants who developed BPD (grey bars) and those who did not (black bars) during the first 21 days of life. Concentrations are expressed as pg of cytokine per μg secretory component ± SEM. Number in parenthesis represents the number of TA samples assayed at each time point.