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Silastic catheters for antibiotics in cystic fibrosis.

1-8% of term infants. The odds ratio for a preterm infant to have eczema was 0-86, and the 95% confidence interval was (0-66 to 1-11). This indicates that preterm infants are at slightly decreased risk of eczema, but that this difference was minimal and not significant. The 95% confidence interval in this analysis excludes 0-56, which is the estimated odds ratio reported by David and Ewing.' Adjustment for maternal race and education (a proxy for social class) did not change the odds ratio substantially. In summary, this analysis of data from the Collaborative Perinatal Project failed to confirm the hypothesis posed by David and Ewing of a decreased risk of atopic eczema among preterm infants followed to 1 year of age.